SecurityvulnsSECURITYVULNS:DOC:22881Microsoft Security Bulletin MS09-072 - Critical Cumulative Security Update for Internet Explorer (976325)
Microsoft Security Bulletin MS09-072 - Critical
Cumulative Security Update for Internet Explorer (976325)
Published: December 08, 2009
Version: 1.0
General Information
Executive Summary
This security update resolves four privately reported vulnerabilities and one publicly disclosed vulnerability in Internet Explorer. The vulnerabilities could allow remote code execution if a user views a specially crafted Web page using Internet Explorer. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights. An ActiveX control built with Microsoft Active Template Library (ATL) headers could also allow remote code execution; for more information about this issue, see the subsection, Frequently Asked Questions (FAQ) Related to This Security Update, in this section.
This security update is rated Critical for all supported releases of Internet Explorer: Internet Explorer 5.01, Internet Explorer 6, Internet Explorer 6 Service Pack 1, Internet Explorer 7 (except when running on supported editions of Windows Server 2003 and Windows Server 2008), and Internet Explorer 8 (except when running on supported editions of Windows Server 2003, Windows Server 2008, and Windows Server 2008 R2). For Internet Explorer 7 and Internet Explorer 8 running on Windows servers as listed, this update is rated Moderate. For more information, see the subsection, Affected and Non-Affected Software, in this section.
The security update addresses these vulnerabilities by correcting the control and by modifying the way that Internet Explorer handles objects in memory. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection under the next section, Vulnerability Information.
This security update also addresses the vulnerability first described in Microsoft Security Advisory 977981.
Recommendation. The majority of customers have automatic updating enabled and will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.
For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update immediately using update management software, or by checking for updates using the Microsoft Update service.
See also the section, Detection and Deployment Tools and Guidance, later in this bulletin.
Known Issues. None
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Affected and Non-Affected Software
The software listed here have been tested to determine which versions or editions are affected. Other versions or editions are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, visit Microsoft Support Lifecycle.
Affected Software
Operating System Component Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by This Update
Internet Explorer 5.01 and Internet Explorer 6 Service Pack 1
Microsoft Windows 2000 Service Pack 4
Internet Explorer 5.01 Service Pack 4
Remote Code Execution
Critical
MS09-054
Microsoft Windows 2000 Service Pack 4
Internet Explorer 6 Service Pack 1
Remote Code Execution
Critical
MS09-054
Internet Explorer 6
Windows XP Service Pack 2 and Windows XP Service Pack 3
Internet Explorer 6
Remote Code Execution
Critical
MS09-054
Windows XP Professional x64 Edition Service Pack 2
Internet Explorer 6
Remote Code Execution
Critical
MS09-054
Windows Server 2003 Service Pack 2
Internet Explorer 6
Remote Code Execution
Critical
MS09-054
Windows Server 2003 x64 Edition Service Pack 2
Internet Explorer 6
Remote Code Execution
Critical
MS09-054
Windows Server 2003 with SP2 for Itanium-based Systems
Internet Explorer 6
Remote Code Execution
Critical
MS09-054
Internet Explorer 7
Windows XP Service Pack 2 and Windows XP Service Pack 3
Internet Explorer 7
Remote Code Execution
Critical
MS09-054
Windows XP Professional x64 Edition Service Pack 2
Internet Explorer 7
Remote Code Execution
Critical
MS09-054
Windows Server 2003 Service Pack 2
Internet Explorer 7
Remote Code Execution
Moderate
MS09-054
Windows Server 2003 x64 Edition Service Pack 2
Internet Explorer 7
Remote Code Execution
Moderate
MS09-054
Windows Server 2003 with SP2 for Itanium-based Systems
Internet Explorer 7
Remote Code Execution
Moderate
MS09-054
Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2
Internet Explorer 7
Remote Code Execution
Critical
MS09-054
Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and Windows Vista x64 Edition Service Pack 2
Internet Explorer 7
Remote Code Execution
Critical
MS09-054
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2*
Internet Explorer 7
Remote Code Execution
Moderate
MS09-054
Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2*
Internet Explorer 7
Remote Code Execution
Moderate
MS09-054
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2
Internet Explorer 7
Remote Code Execution
Moderate
MS09-054
Internet Explorer 8
Windows XP Service Pack 2 and Windows XP Service Pack 3
Internet Explorer 8
Remote Code Execution
Critical
MS09-054
Windows XP Professional x64 Edition Service Pack 2
Internet Explorer 8
Remote Code Execution
Critical
MS09-054
Windows Server 2003 Service Pack 2
Internet Explorer 8
Remote Code Execution
Moderate
MS09-054
Windows Server 2003 x64 Edition Service Pack 2
Internet Explorer 8
Remote Code Execution
Moderate
MS09-054
Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2
Internet Explorer 8
Remote Code Execution
Critical
MS09-054
Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and Windows Vista x64 Edition Service Pack 2
Internet Explorer 8
Remote Code Execution
Critical
MS09-054
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2*
Internet Explorer 8
Remote Code Execution
Moderate
MS09-054
Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2*
Internet Explorer 8
Remote Code Execution
Moderate
MS09-054
Windows 7 for 32-bit Systems
Internet Explorer 8
Remote Code Execution
Critical
MS09-054
Windows 7 for x64-based Systems
Internet Explorer 8
Remote Code Execution
Critical
MS09-054
Windows Server 2008 R2 for x64-based Systems*
Internet Explorer 8
Remote Code Execution
Moderate
MS09-054
Windows Server 2008 R2 for Itanium-based Systems
Internet Explorer 8
Remote Code Execution
Moderate
MS09-054
*Server Core installation not affected. The vulnerabilities addressed by this update do not affect supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, when installed using the Server Core installation option. For more information on this installation option, see the MSDN articles, Server Core and Server Core for Windows Server 2008 R2. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.
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Frequently Asked Questions (FAQ) Related to This Security Update
Does this security update include the fix that resolves known issues for MS09-054 that were resolved in Microsoft Knowledge Base Article 976749?
Yes. This security update (976325) includes the fix described in Microsoft Security Advisory 976749 that resolves known issues for security update 974455 in Microsoft Security Bulletin MS09-054.
How does this security bulletin relate to the ATL issue described in MS09-035?
Microsoft Security Bulletin MS09-035 describes vulnerabilities in those components and controls that have been developed using vulnerable public versions of the Active Template Library (ATL). This security update (976325) helps mitigate known attack vectors within Internet Explorer for those components and controls that have been developed with the versions of ATL described in Microsoft Security Advisory 973882 and MS09-035. See also the ATL COM Initialization Vulnerability, CVE-2009-2493, in the next section, Vulnerability Information.
How does this security bulletin relate to the ATL issue described in Microsoft Security Advisory 973882?
Microsoft Security Advisory 973882 describes vulnerabilities in public and private versions of the Active Template Library (ATL). This security update (976325) updates a control developed with the versions of ATL described in Microsoft Security Advisory 973882 and MS09-035. . See also the ATL COM Initialization Vulnerability, CVE-2009-2493, in the next section, Vulnerability Information.
Where can I find more information about the Microsoft Active Template Library security vulnerabilities and associated updates?
For more information regarding the Active Template Library (ATL) security vulnerabilities, see Microsoft Security Advisory 973882.
To download the update for ATL, see Microsoft Security Bulletin MS09-035.
If I have installed the MS09-035 update, do I still need to install this update?
Yes. MS09-035 is specifically intended for developers who use the Active Template Library (ATL) with Microsoft Visual Studio. Developers who redistribute components and controls built with ATL should install the update provided in MS09-035 to ensure that these components and controls do not contain the vulnerabilities described in that bulletin.
Where are the file information details?
The file information details can be found in the Microsoft Knowledge Base Article 976325.
I am using an older release of the software discussed in this security bulletin. What should I do?
The affected software listed in this bulletin have been tested to determine which releases are affected. Other releases are past their support life cycle. For more information about the product lifecycle, visit the Microsoft Support Lifecycle Web site.
It should be a priority for customers who have older releases of the software to migrate to supported releases to prevent potential exposure to vulnerabilities. To determine the support lifecycle for your software release, see Select a Product for Lifecycle Information. For more information about service packs for these software releases, see Lifecycle Supported Service Packs.
Customers who require custom support for older software must contact their Microsoft account team representative, their Technical Account Manager, or the appropriate Microsoft partner representative for custom support options. Customers without an Alliance, Premier, or Authorized Contract can contact their local Microsoft sales office. For contact information, visit the Microsoft Worldwide Information Web site, select the country in the Contact Information list, and then click Go to see a list of telephone numbers. When you call, ask to speak with the local Premier Support sales manager. For more information, see the Microsoft Support Lifecycle Policy FAQ.
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Vulnerability Information
Severity Ratings and Vulnerability Identifiers
The following severity ratings assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin's release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the December bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software ATL COM Initialization Vulnerability - CVE-2009-2493 Uninitialized Memory Corruption Vulnerability - CVE-2009-3671 HTML Object Memory Corruption Vulnerability - CVE-2009-3672 Uninitialized Memory Corruption Vulnerability - CVE-2009-3673 Uninitialized Memory Corruption Vulnerability - CVE-2009-3674 Aggregate Severity Rating
Internet Explorer 5.01 and Internet Explorer 6 Service Pack 1
Internet Explorer 5.01 Service Pack 4 when installed on Microsoft Windows 2000 Service Pack 4
Critical
Remote Code Execution
Not applicable
Not applicable
Not applicable
Not applicable
Critical
Internet Explorer 6 Service Pack 1 when installed on Microsoft Windows 2000 Service Pack 4
Critical
Remote Code Execution
Not applicable
Critical
Remote Code Execution
Not applicable
Not applicable
Critical
Internet Explorer 6
Internet Explorer 6 for Windows XP Service Pack 2 and Windows XP Service Pack 3
Critical
Remote Code Execution
Not applicable
Critical
Remote Code Execution
Not applicable
Not applicable
Critical
Internet Explorer 6 for Windows XP Professional x64 Edition Service Pack 2
Critical
Remote Code Execution
Not applicable
Critical
Remote Code Execution
Not applicable
Not applicable
Critical
Internet Explorer 6 for Windows Server 2003 Service Pack 2
Critical
Remote Code Execution
Not applicable
Moderate
Remote Code Execution
Not applicable
Not applicable
Critical
Internet Explorer 6 for Windows Server 2003 x64 Edition Service Pack 2
Critical
Remote Code Execution
Not applicable
Moderate
Remote Code Execution
Not applicable
Not applicable
Critical
Internet Explorer 6 for Windows Server 2003 with SP2 for Itanium-based Systems
Critical
Remote Code Execution
Not applicable
Moderate
Remote Code Execution
Not applicable
Not applicable
Critical
Internet Explorer 7
Internet Explorer 7 for Windows XP Service Pack 2 and Windows XP Service Pack 3
Not applicable
Not applicable
Critical
Remote Code Execution
Critical
Remote Code Execution
Not applicable
Critical
Internet Explorer 7 for Windows XP Professional x64 Edition Service Pack 2
Not applicable
Not applicable
Critical
Remote Code Execution
Critical
Remote Code Execution
Not applicable
Critical
Internet Explorer 7 for Windows Server 2003 Service Pack 2
Not applicable
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Not applicable
Moderate
Internet Explorer 7 for Windows Server 2003 x64 Edition Service Pack 2
Not applicable
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Not applicable
Moderate
Internet Explorer 7 for Windows Server 2003 with SP2 for Itanium-based Systems
Not applicable
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Not applicable
Moderate
Internet Explorer 7 in Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2
Not applicable
Not applicable
Critical
Remote Code Execution
Critical
Remote Code Execution
Not applicable
Critical
Internet Explorer 7 in Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and Windows Vista x64 Edition Service Pack 2
Not applicable
Not applicable
Critical
Remote Code Execution
Critical
Remote Code Execution
Not applicable
Critical
Internet Explorer 7 in Windows Server 2008 for 32-bit Systems* and Windows Server 2008 for 32-bit Systems Service Pack 2*
Not applicable
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Not applicable
Moderate
Internet Explorer 7 in Windows Server 2008 for x64-based Systems* and Windows Server 2008 for x64-based Systems Service Pack 2*
Not applicable
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Not applicable
Moderate
Internet Explorer 7 in Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2
Not applicable
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Not applicable
Moderate
Internet Explorer 8
Internet Explorer 8 for Windows XP Service Pack 2 and Windows XP Service Pack 3
Not applicable
Critical
Remote Code Execution
Not applicable
Critical
Remote Code Execution
Critical
Remote Code Execution
Critical
Internet Explorer 8 for Windows XP Professional x64 Edition Service Pack 2
Not applicable
Critical
Remote Code Execution
Not applicable
Critical
Remote Code Execution
Critical
Remote Code Execution
Critical
Internet Explorer 8 for Windows Server 2003 Service Pack 2
Not applicable
Moderate
Remote Code Execution
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Moderate
Internet Explorer 8 for Windows Server 2003 x64 Edition Service Pack 2
Not applicable
Moderate
Remote Code Execution
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Moderate
Internet Explorer 8 in Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2
Not applicable
Critical
Remote Code Execution
Not applicable
Critical
Remote Code Execution
Critical
Remote Code Execution
Critical
Internet Explorer 8 in Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and Windows Vista x64 Edition Service Pack 2
Not applicable
Critical
Remote Code Execution
Not applicable
Critical
Remote Code Execution
Critical
Remote Code Execution
Critical
Internet Explorer 8 in Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2*
Not applicable
Moderate
Remote Code Execution
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Moderate
Internet Explorer 8 in Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2*
Not applicable
Moderate
Remote Code Execution
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Moderate
Internet Explorer 8 in Windows 7 for 32-bit Systems
Not applicable
Critical
Remote Code Execution
Not applicable
Critical
Remote Code Execution
Critical
Remote Code Execution
Critical
Internet Explorer 8 in Windows 7 for x64-based Systems
Not applicable
Critical
Remote Code Execution
Not applicable
Critical
Remote Code Execution
Critical
Remote Code Execution
Critical
Internet Explorer 8 in Windows Server 2008 R2 for x64-based Systems*
Not applicable
Moderate
Remote Code Execution
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Moderate
Internet Explorer 8 in Windows Server 2008 R2 for Itanium-based Systems
Not applicable
Moderate
Remote Code Execution
Not applicable
Moderate
Remote Code Execution
Moderate
Remote Code Execution
Moderate
*Server Core installation not affected. The vulnerabilities addressed by this update do not affect supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, when installed using the Server Core installation option. For more information on this installation option, see the MSDN articles, Server Core and Server Core for Windows Server 2008 R2. Note that the Server Core installation option does not apply to certain editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server Core Installation Options.
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ATL COM Initialization Vulnerability - CVE-2009-2493
A remote code execution vulnerability exists in an ActiveX control built with vulnerable Microsoft Active Template Library (ATL) headers. This vulnerability only directly affects systems with components and controls installed that were built using Visual Studio ATL. Components and controls built using ATL could allow the instantiation of arbitrary objects that can bypass related security policy, such as kill bits within Internet Explorer. Therefore, this vulnerability could allow a remote, unauthenticated user to perform remote code execution on an affected system. An attacker could exploit the vulnerability by constructing a specially crafted Web page. When a user views the Web page, the vulnerability could allow remote code execution.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2009-2493.
Mitigating Factors for ATL COM Initialization Vulnerability - CVE-2009-2493
Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:
•
In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site.
•
An attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
•
By default, all supported versions of Microsoft Outlook, Microsoft Outlook Express, and Windows Mail open HTML e-mail messages in the Restricted sites zone. The Restricted sites zone helps mitigate attacks that could try to exploit this vulnerability by preventing Active Scripting and ActiveX controls from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, the user could still be vulnerable to exploitation of this vulnerability through the Web-based attack scenario.
•
By default, Internet Explorer on Windows Server 2003 and Windows Server 2008 runs in a restricted mode that is known as Enhanced Security Configuration. This mode sets the security level for the Internet zone to High. This is a mitigating factor for Web sites that you have not added to the Internet Explorer Trusted sites zone. See the FAQ subsection of this vulnerability section for more information about Internet Explorer Enhanced Security Configuration.
•
Internet Explorer 7 and Internet Explorer 8 are not affected by this vulnerability.
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Workarounds for ATL COM Initialization Vulnerability - CVE-2009-2493
Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:
•
Set Internet and Local intranet security zone settings to "High" to prompt before running ActiveX Controls and Active Scripting in these zones
You can help protect against exploitation of this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls and Active Scripting. You can do this by setting your browser security to High.
To raise the browsing security level in Internet Explorer, follow these steps:
On the Internet Explorer Tools menu, click Internet Options.
In the Internet Options dialog box, click the Security tab, and then click the Internet icon.
Under Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.
Note If no slider is visible, click Default Level, and then move the slider to High.
Note Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.
Impact of workaround. There are side effects to prompting before running ActiveX Controls and Active Scripting. Many Web sites that are on the Internet or on an intranet use ActiveX or Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX Controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX Controls or Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX Controls or Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone".
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.
To do this, follow these steps:
In Internet Explorer, click Tools, click Internet Options, and then click the Security tab.
In the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.
If you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.
In the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.
Repeat these steps for each site that you want to add to the zone.
Click OK two times to accept the changes and return to Internet Explorer.
Note Add any sites that you trust not to take malicious action on your system. Two in particular that you may want to add are *.windowsupdate.microsoft.com and *.update.microsoft.com. These are the sites that will host the update, and it requires an ActiveX Control to install the update.
•
Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone
You can help protect against exploitation of this vulnerability by changing your settings to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone. To do this, follow these steps:
In Internet Explorer, click Internet Options on the Tools menu.
Click the Security tab.
Click Internet, and then click Custom Level.
Under Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.
Click Local intranet, and then click Custom Level.
Under Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.
Click OK two times to return to Internet Explorer.
Note Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly.
Impact of workaround. There are side effects to prompting before running Active Scripting. Many Web sites that are on the Internet or on an intranet use Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use Active Scripting to provide menus, ordering forms, or even account statements. Prompting before running Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone".
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.
To do this, follow these steps:
In Internet Explorer, click Tools, click Internet Options, and then click the Security tab.
In the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.
If you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.
In the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.
Repeat these steps for each site that you want to add to the zone.
Click OK two times to accept the changes and return to Internet Explorer.
Note Add any sites that you trust not to take malicious action on your system. Two in particular that you may want to add are *.windowsupdate.microsoft.com and *.update.microsoft.com. These are the sites that will host the update, and it requires an ActiveX Control to install the update.
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FAQ for ATL COM Initialization Vulnerability - CVE-2009-2493
What is the scope of the vulnerability?
This is a remote code execution vulnerability. The vulnerability could allow remote code execution if the user visits a specially crafted Web page with Internet Explorer, instantiating a vulnerable component or control. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user.
If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
What causes the vulnerability?
The vulnerability results from an ActiveX control built with vulnerable Microsoft Active Template Library (ATL) headers. Unsafe usage of this control could allow the instantiation of arbitrary objects that can bypass certain related security policies.
What might an attacker use the vulnerability to do?
If a user's system has a vulnerable control and an attacker bypasses the mitigations described in Microsoft Security Advisory 973882, and if the user is logged on with administrative user rights, then an attacker could take complete control of the affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
How could an attacker exploit the vulnerability?
An attacker could host a specially crafted Web site that is designed to exploit this vulnerability through Internet Explorer and then convince a user to view the Web site. The attacker could also take advantage of compromised Web sites and Web sites that accept or host user-provided content or advertisements. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger message that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.
What is the component affected by the vulnerability?
The component affected by the vulnerability is tdc.ocx.
What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be at more risk if users who should not have sufficient administrative permissions are given the ability to log on to servers and to run programs. However, best practices strongly discourage allowing this.
I am running Internet Explorer for Windows Server 2003 or Windows Server 2008. Does this mitigate this vulnerability?
Yes. By default, Internet Explorer on Windows Server 2003 and Windows Server 2008 runs in a restricted mode that is known as Enhanced Security Configuration. Enhanced Security Configuration is a group of preconfigured settings in Internet Explorer that can reduce the likelihood of a user or administrator downloading and running specially crafted Web content on a server. This is a mitigating factor for Web sites that you have not added to the Internet Explorer Trusted sites zone. See also Managing Internet Explorer Enhanced Security Configuration.
What does the update do?
The update addresses the vulnerability by correcting a control that handles tabular data. This control was previously built using vulnerable Microsoft Active Template Library (ATL).
When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through responsible disclosure.
When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.
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Uninitialized Memory Corruption Vulnerability - CVE-2009-3671
A remote code execution vulnerability exists in the way that Internet Explorer accesses an object that has not been correctly initialized or has been deleted. An attacker could exploit the vulnerability by constructing a specially crafted Web page. When a user views the Web page, the vulnerability could allow remote code execution. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2009-3671.
Mitigating Factors for Uninitialized Memory Corruption Vulnerability - CVE-2009-3671
Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:
•
In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site.
•
An attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
•
By default, all supported versions of Microsoft Outlook, Microsoft Outlook Express, and Windows Mail open HTML e-mail messages in the Restricted sites zone. The Restricted sites zone helps mitigate attacks that could try to exploit this vulnerability by preventing Active Scripting and ActiveX controls from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, the user could still be vulnerable to exploitation of this vulnerability through the Web-based attack scenario.
•
By default, Internet Explorer on Windows Server 2003 and Windows Server 2008 runs in a restricted mode that is known as Enhanced Security Configuration. This mode sets the security level for the Internet zone to High. This is a mitigating factor for Web sites that you have not added to the Internet Explorer Trusted sites zone. See the FAQ subsection of this vulnerability section for more information about Internet Explorer Enhanced Security Configuration.
•
Internet Explorer 5.01 Service Pack 4, Internet Explorer 6.0, Internet Explorer 6 Service Pack 1, and Internet Explorer 7 are not affected by this vulnerability.
Top of sectionTop of section
Workarounds for Uninitialized Memory Corruption Vulnerability - CVE-2009-3671
Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:
•
Set Internet and Local intranet security zone settings to "High" to prompt before running ActiveX Controls and Active Scripting in these zones
You can help protect against exploitation of this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls and Active Scripting. You can do this by setting your browser security to High.
To raise the browsing security level in Internet Explorer, follow these steps:
On the Internet Explorer Tools menu, click Internet Options.
In the Internet Options dialog box, click the Security tab, and then click the Internet icon.
Under Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.
Note If no slider is visible, click Default Level, and then move the slider to High.
Note Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.
Impact of workaround. There are side effects to prompting before running ActiveX Controls and Active Scripting. Many Web sites that are on the Internet or on an intranet use ActiveX or Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX Controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX Controls or Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX Controls or Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone".
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.
To do this, follow these steps:
In Internet Explorer, click Tools, click Internet Options, and then click the Security tab.
In the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.
If you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.
In the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.
Repeat these steps for each site that you want to add to the zone.
Click OK two times to accept the changes and return to Internet Explorer.
Note Add any sites that you trust not to take malicious action on your system. Two in particular that you may want to add are *.windowsupdate.microsoft.com and *.update.microsoft.com. These are the sites that will host the update, and it requires an ActiveX Control to install the update.
•
Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone
You can help protect against exploitation of this vulnerability by changing your settings to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone. To do this, follow these steps:
In Internet Explorer, click Internet Options on the Tools menu.
Click the Security tab.
Click Internet, and then click Custom Level.
Under Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.
Click Local intranet, and then click Custom Level.
Under Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.
Click OK two times to return to Internet Explorer.
Note Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly.
Impact of workaround. There are side effects to prompting before running Active Scripting. Many Web sites that are on the Internet or on an intranet use Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use Active Scripting to provide menus, ordering forms, or even account statements. Prompting before running Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone".
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.
To do this, follow these steps:
In Internet Explorer, click Tools, click Internet Options, and then click the Security tab.
In the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.
If you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.
In the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.
Repeat these steps for each site that you want to add to the zone.
Click OK two times to accept the changes and return to Internet Explorer.
Note Add any sites that you trust not to take malicious action on your system. Two in particular that you may want to add are *.windowsupdate.microsoft.com and *.update.microsoft.com. These are the sites that will host the update, and it requires an ActiveX Control to install the update.
Top of sectionTop of section
FAQ for Uninitialized Memory Corruption Vulnerability - CVE-2009-3671
What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
What causes the vulnerability?
When Internet Explorer attempts to access an object that has not been initialized or has been deleted, it may corrupt memory in such a way that an attacker could execute arbitrary code in the context of the logged-on user.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could gain the same user rights as a logged-on user. If the user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
How could an attacker exploit the vulnerability?
An attacker could host a specially crafted Web site that is designed to exploit this vulnerability through Internet Explorer and then convince a user to view the Web site. The attacker could also take advantage of compromised Web sites and Web sites that accept or host user-provided content or advertisements. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger message that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.
What systems are primarily at risk from the vulnerability?
This vulnerability requires that a user be logged on and visiting a Web site for any malicious action to occur. Therefore, any systems where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.
I am running Internet Explorer for Windows Server 2003 or Windows Server 2008. Does this mitigate this vulnerability?
Yes. By default, Internet Explorer on Windows Server 2003 and Windows Server 2008 runs in a restricted mode that is known as Enhanced Security Configuration. Enhanced Security Configuration is a group of preconfigured settings in Internet Explorer that can reduce the likelihood of a user or administrator downloading and running specially crafted Web content on a server. This is a mitigating factor for Web sites that you have not added to the Internet Explorer Trusted sites zone. See also Managing Internet Explorer Enhanced Security Configuration.
What does the update do?
The update modifies the way that Internet Explorer handles objects in memory.
When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through responsible disclosure.
When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.
Top of sectionTop of section
Top of sectionTop of section
HTML Object Memory Corruption Vulnerability - CVE-2009-3672
A remote code execution vulnerability exists in the way that Internet Explorer accesses an object that has not been correctly initialized or has been deleted. An attacker could exploit the vulnerability by constructing a specially crafted Web page. When a user views the Web page, the vulnerability could allow remote code execution. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2009-3672.
Mitigating Factors for HTML Object Memory Corruption Vulnerability - CVE-2009-3672
Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:
•
In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site.
•
An attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
•
By default, all supported versions of Microsoft Outlook, Microsoft Outlook Express, and Windows Mail open HTML e-mail messages in the Restricted sites zone. The Restricted sites zone helps mitigate attacks that could try to exploit this vulnerability by preventing Active Scripting and ActiveX controls from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, the user could still be vulnerable to exploitation of this vulnerability through the Web-based attack scenario.
•
By default, Internet Explorer on Windows Server 2003 and Windows Server 2008 runs in a restricted mode that is known as Enhanced Security Configuration. This mode sets the security level for the Internet zone to High. This is a mitigating factor for Web sites that you have not added to the Internet Explorer Trusted sites zone. See the FAQ subsection of this vulnerability section for more information about Internet Explorer Enhanced Security Configuration.
•
Internet Explorer 5.01 Service Pack 4 and Internet Explorer 8 are not affected by this vulnerability.
Top of sectionTop of section
Workarounds for HTML Object Memory Corruption Vulnerability - CVE-2009-3672
Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:
•
Set Internet and Local intranet security zone settings to "High" to prompt before running ActiveX Controls and Active Scripting in these zones
You can help protect against exploitation of this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls and Active Scripting. You can do this by setting your browser security to High.
To raise the browsing security level in Internet Explorer, follow these steps:
On the Internet Explorer Tools menu, click Internet Options.
In the Internet Options dialog box, click the Security tab, and then click the Internet icon.
Under Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.
Note If no slider is visible, click Default Level, and then move the slider to High.
Note Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.
Impact of workaround. There are side effects to prompting before running ActiveX Controls and Active Scripting. Many Web sites that are on the Internet or on an intranet use ActiveX or Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX Controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX Controls or Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX Controls or Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone".
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.
To do this, follow these steps:
In Internet Explorer, click Tools, click Internet Options, and then click the Security tab.
In the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.
If you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.
In the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.
Repeat these steps for each site that you want to add to the zone.
Click OK two times to accept the changes and return to Internet Explorer.
Note Add any sites that you trust not to take malicious action on your system. Two in particular that you may want to add are *.windowsupdate.microsoft.com and *.update.microsoft.com. These are the sites that will host the update, and it requires an ActiveX Control to install the update.
•
Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone
You can help protect against exploitation of this vulnerability by changing your settings to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone. To do this, follow these steps:
In Internet Explorer, click Internet Options on the Tools menu.
Click the Security tab.
Click Internet, and then click Custom Level.
Under Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.
Click Local intranet, and then click Custom Level.
Under Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.
Click OK two times to return to Internet Explorer.
Note Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly.
Impact of workaround. There are side effects to prompting before running Active Scripting. Many Web sites that are on the Internet or on an intranet use Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use Active Scripting to provide menus, ordering forms, or even account statements. Prompting before running Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone".
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.
To do this, follow these steps:
In Internet Explorer, click Tools, click Internet Options, and then click the Security tab.
In the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.
If you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.
In the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.
Repeat these steps for each site that you want to add to the zone.
Click OK two times to accept the changes and return to Internet Explorer.
Note Add any sites that you trust not to take malicious action on your system. Two in particular that you may want to add are *.windowsupdate.microsoft.com and *.update.microsoft.com. These are the sites that will host the update, and it requires an ActiveX Control to install the update.
•
Enable DEP for Internet Explorer 6 or Internet Explorer 7
This vulnerability is more difficult to exploit successfully if Data Execution Protection (DEP) is enabled for Internet Explorer. You can enable DEP for all versions of Internet Explorer that support DEP, using one of the following methods:
•
Enable DEP for Internet Explorer 7 interactively
Local Administrators can control DEP/NX by running Internet Explorer as an Administrator. To enable DEP, perform the following steps:
In Internet Explorer, click Tools, click Internet Options, and then click Advanced.
Click Enable memory protection to help mitigate online attacks.
•
Enable DEP for Internet Explorer 6 or Internet Explorer 7 using automated Microsoft Fix It
See Microsoft Knowledge Base Article 976325 to use the automated Microsoft Fix it solution to enable or disable this workaround.
Impact of workaround: Some browser extensions may not be compatible with DEP and may exit unexpectedly. If this occurs, you can disable the add-on, or revert the DEP setting using the Internet Control Panel. This is also accessible using the System Control panel.
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FAQ for HTML Object Memory Corruption Vulnerability - CVE-2009-3672
What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
What causes the vulnerability?
When Internet Explorer attempts to access incorrectly initialized memory under certain conditions, it may corrupt memory in such a way that an attacker could execute arbitrary code in the context of the logged-on user.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could gain the same user rights as a logged-on user. If the user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
How could an attacker exploit the vulnerability?
An attacker could host a specially crafted Web site that is designed to exploit this vulnerability through Internet Explorer and then convince a user to view the Web site. The attacker could also take advantage of compromised Web sites and Web sites that accept or host user-provided content or advertisements. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger message that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.
What systems are primarily at risk from the vulnerability?
This vulnerability requires that a user be logged on and visiting a Web site for any malicious action to occur. Therefore, any systems where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.
I am running Internet Explorer for Windows Server 2003 or Windows Server 2008. Does this mitigate this vulnerability?
Yes. By default, Internet Explorer on Windows Server 2003 and Windows Server 2008 runs in a restricted mode that is known as Enhanced Security Configuration. Enhanced Security Configuration is a group of preconfigured settings in Internet Explorer that can reduce the likelihood of a user or administrator downloading and running specially crafted Web content on a server. This is a mitigating factor for Web sites that you have not added to the Internet Explorer Trusted sites zone. See also Managing Internet Explorer Enhanced Security Configuration.
What does the update do?
The update modifies the way that Internet Explorer handles objects in memory.
When this security bulletin was issued, had this vulnerability been publicly disclosed?
Yes. This vulnerability has been publicly disclosed. It has been assigned Common Vulnerability and Exposure number CVE-2009-3672.
When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.
Top of sectionTop of section
Top of sectionTop of section
Uninitialized Memory Corruption Vulnerability - CVE-2009-3673
A remote code execution vulnerability exists in the way that Internet Explorer accesses an object that has not been correctly initialized or has been deleted. An attacker could exploit the vulnerability by constructing a specially crafted Web page. When a user views the Web page, the vulnerability could allow remote code execution. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2009-3673.
Mitigating Factors for Uninitialized Memory Corruption Vulnerability - CVE-2009-3673
Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:
•
In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site.
•
An attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
•
By default, all supported versions of Microsoft Outlook, Microsoft Outlook Express, and Windows Mail open HTML e-mail messages in the Restricted sites zone. The Restricted sites zone helps mitigate attacks that could try to exploit this vulnerability by preventing Active Scripting and ActiveX controls from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, the user could still be vulnerable to exploitation of this vulnerability through the Web-based attack scenario.
•
By default, Internet Explorer on Windows Server 2003 and Windows Server 2008 runs in a restricted mode that is known as Enhanced Security Configuration. This mode sets the security level for the Internet zone to High. This is a mitigating factor for Web sites that you have not added to the Internet Explorer Trusted sites zone. See the FAQ subsection of this vulnerability section for more information about Internet Explorer Enhanced Security Configuration.
•
Internet Explorer 5.01 Service Pack 4, Internet Explorer 6.0, and Internet Explorer 6 Service Pack 1 are not affected by this vulnerability.
Top of sectionTop of section
Workarounds for Uninitialized Memory Corruption Vulnerability - CVE-2009-3673
Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:
•
Set Internet and Local intranet security zone settings to "High" to prompt before running ActiveX Controls and Active Scripting in these zones
You can help protect against exploitation of this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls and Active Scripting. You can do this by setting your browser security to High.
To raise the browsing security level in Internet Explorer, follow these steps:
On the Internet Explorer Tools menu, click Internet Options.
In the Internet Options dialog box, click the Security tab, and then click the Internet icon.
Under Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.
Note If no slider is visible, click Default Level, and then move the slider to High.
Note Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.
Impact of workaround. There are side effects to prompting before running ActiveX Controls and Active Scripting. Many Web sites that are on the Internet or on an intranet use ActiveX or Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX Controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX Controls or Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX Controls or Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone".
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.
To do this, follow these steps:
In Internet Explorer, click Tools, click Internet Options, and then click the Security tab.
In the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.
If you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.
In the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.
Repeat these steps for each site that you want to add to the zone.
Click OK two times to accept the changes and return to Internet Explorer.
Note Add any sites that you trust not to take malicious action on your system. Two in particular that you may want to add are *.windowsupdate.microsoft.com and *.update.microsoft.com. These are the sites that will host the update, and it requires an ActiveX Control to install the update.
•
Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone
You can help protect against exploitation of this vulnerability by changing your settings to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone. To do this, follow these steps:
In Internet Explorer, click Internet Options on the Tools menu.
Click the Security tab.
Click Internet, and then click Custom Level.
Under Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.
Click Local intranet, and then click Custom Level.
Under Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.
Click OK two times to return to Internet Explorer.
Note Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly.
Impact of workaround. There are side effects to prompting before running Active Scripting. Many Web sites that are on the Internet or on an intranet use Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use Active Scripting to provide menus, ordering forms, or even account statements. Prompting before running Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone".
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.
To do this, follow these steps:
In Internet Explorer, click Tools, click Internet Options, and then click the Security tab.
In the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.
If you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.
In the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.
Repeat these steps for each site that you want to add to the zone.
Click OK two times to accept the changes and return to Internet Explorer.
Note Add any sites that you trust not to take malicious action on your system. Two in particular that you may want to add are *.windowsupdate.microsoft.com and *.update.microsoft.com. These are the sites that will host the update, and it requires an ActiveX Control to install the update.
Top of sectionTop of section
FAQ for Uninitialized Memory Corruption Vulnerability - CVE-2009-3673
What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
What causes the vulnerability?
When Internet Explorer attempts to access an object that has not been initialized or has been deleted, it may corrupt memory in such a way that an attacker could execute arbitrary code in the context of the logged-on user.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could gain the same user rights as a logged-on user. If the user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
How could an attacker exploit the vulnerability?
An attacker could host a specially crafted Web site that is designed to exploit this vulnerability through Internet Explorer and then convince a user to view the Web site. The attacker could also take advantage of compromised Web sites and Web sites that accept or host user-provided content or advertisements. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger message that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.
What systems are primarily at risk from the vulnerability?
This vulnerability requires that a user be logged on and visiting a Web site for any malicious action to occur. Therefore, any systems where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.
I am running Internet Explorer for Windows Server 2003 or Windows Server 2008. Does this mitigate this vulnerability?
Yes. By default, Internet Explorer on Windows Server 2003 and Windows Server 2008 runs in a restricted mode that is known as Enhanced Security Configuration. Enhanced Security Configuration is a group of preconfigured settings in Internet Explorer that can reduce the likelihood of a user or administrator downloading and running specially crafted Web content on a server. This is a mitigating factor for Web sites that you have not added to the Internet Explorer Trusted sites zone. See also Managing Internet Explorer Enhanced Security Configuration.
What does the update do?
The update modifies the way that Internet Explorer handles objects in memory.
When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through responsible disclosure.
When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.
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Uninitialized Memory Corruption Vulnerability - CVE-2009-3674
A remote code execution vulnerability exists in the way that Internet Explorer accesses an object that has not been correctly initialized or has been deleted. An attacker could exploit the vulnerability by constructing a specially crafted Web page. When a user views the Web page, the vulnerability could allow remote code execution. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2009-3674.
Mitigating Factors for Uninitialized Memory Corruption Vulnerability - CVE-2009-3674
Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:
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In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site.
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An attacker who successfully exploited this vulnerability could gain the same user rights as the local user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
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By default, all supported versions of Microsoft Outlook, Microsoft Outlook Express, and Windows Mail open HTML e-mail messages in the Restricted sites zone. The Restricted sites zone helps mitigate attacks that could try to exploit this vulnerability by preventing Active Scripting and ActiveX controls from being used when reading HTML e-mail messages. However, if a user clicks a link in an e-mail message, the user could still be vulnerable to exploitation of this vulnerability through the Web-based attack scenario.
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By default, Internet Explorer on Windows Server 2003 and Windows Server 2008 runs in a restricted mode that is known as Enhanced Security Configuration. This mode sets the security level for the Internet zone to High. This is a mitigating factor for Web sites that you have not added to the Internet Explorer Trusted sites zone. See the FAQ subsection of this vulnerability section for more information about Internet Explorer Enhanced Security Configuration.
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Internet Explorer 5.01 Service Pack 4, Internet Explorer 6, Internet Explorer 6 Service Pack 1, and Internet Explorer 7 are not affected by this vulnerability.
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Workarounds for Uninitialized Memory Corruption Vulnerability - CVE-2009-3674
Workaround refers to a setting or configuration change that does not correct the underlying vulnerability but would help block known attack vectors before you apply the update. Microsoft has tested the following workarounds and states in the discussion whether a workaround reduces functionality:
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Set Internet and Local intranet security zone settings to "High" to prompt before running ActiveX Controls and Active Scripting in these zones
You can help protect against exploitation of this vulnerability by changing your settings for the Internet security zone to prompt before running ActiveX controls and Active Scripting. You can do this by setting your browser security to High.
To raise the browsing security level in Internet Explorer, follow these steps:
On the Internet Explorer Tools menu, click Internet Options.
In the Internet Options dialog box, click the Security tab, and then click the Internet icon.
Under Security level for this zone, move the slider to High. This sets the security level for all Web sites you visit to High.
Note If no slider is visible, click Default Level, and then move the slider to High.
Note Setting the level to High may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly even with the security setting set to High.
Impact of workaround. There are side effects to prompting before running ActiveX Controls and Active Scripting. Many Web sites that are on the Internet or on an intranet use ActiveX or Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use ActiveX Controls to provide menus, ordering forms, or even account statements. Prompting before running ActiveX Controls or Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run ActiveX Controls or Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone".
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.
To do this, follow these steps:
In Internet Explorer, click Tools, click Internet Options, and then click the Security tab.
In the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.
If you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.
In the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.
Repeat these steps for each site that you want to add to the zone.
Click OK two times to accept the changes and return to Internet Explorer.
Note Add any sites that you trust not to take malicious action on your system. Two in particular that you may want to add are *.windowsupdate.microsoft.com and *.update.microsoft.com. These are the sites that will host the update, and it requires an ActiveX Control to install the update.
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Configure Internet Explorer to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone
You can help protect against exploitation of this vulnerability by changing your settings to prompt before running Active Scripting or to disable Active Scripting in the Internet and Local intranet security zone. To do this, follow these steps:
In Internet Explorer, click Internet Options on the Tools menu.
Click the Security tab.
Click Internet, and then click Custom Level.
Under Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.
Click Local intranet, and then click Custom Level.
Under Settings, in the Scripting section, under Active Scripting, click Prompt or Disable, and then click OK.
Click OK two times to return to Internet Explorer.
Note Disabling Active Scripting in the Internet and Local intranet security zones may cause some Web sites to work incorrectly. If you have difficulty using a Web site after you change this setting, and you are sure the site is safe to use, you can add that site to your list of trusted sites. This will allow the site to work correctly.
Impact of workaround. There are side effects to prompting before running Active Scripting. Many Web sites that are on the Internet or on an intranet use Active Scripting to provide additional functionality. For example, an online e-commerce site or banking site may use Active Scripting to provide menus, ordering forms, or even account statements. Prompting before running Active Scripting is a global setting that affects all Internet and intranet sites. You will be prompted frequently when you enable this workaround. For each prompt, if you feel you trust the site that you are visiting, click Yes to run Active Scripting. If you do not want to be prompted for all these sites, use the steps outlined in "Add sites that you trust to the Internet Explorer Trusted sites zone".
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX controls and Active Scripting in the Internet zone and in the Local intranet zone, you can add sites that you trust to the Internet Explorer Trusted sites zone. This will allow you to continue to use trusted Web sites exactly as you do today, while helping to protect you from this attack on untrusted sites. We recommend that you add only sites that you trust to the Trusted sites zone.
To do this, follow these steps:
In Internet Explorer, click Tools, click Internet Options, and then click the Security tab.
In the Select a Web content zone to specify its current security settings box, click Trusted Sites, and then click Sites.
If you want to add sites that do not require an encrypted channel, click to clear the Require server verification (https:) for all sites in this zone check box.
In the Add this Web site to the zone box, type the URL of a site that you trust, and then click Add.
Repeat these steps for each site that you want to add to the zone.
Click OK two times to accept the changes and return to Internet Explorer.
Note Add any sites that you trust not to take malicious action on your system. Two in particular that you may want to add are *.windowsupdate.microsoft.com and *.update.microsoft.com. These are the sites that will host the update, and it requires an ActiveX Control to install the update.
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FAQ for Uninitialized Memory Corruption Vulnerability - CVE-2009-3674
What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
What causes the vulnerability?
When Internet Explorer attempts to access an object that has not been initialized or has been deleted, it may corrupt memory in such a way that an attacker could execute arbitrary code in the context of the logged-on user.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could gain the same user rights as a logged-on user. If the user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
How could an attacker exploit the vulnerability?
An attacker could host a specially crafted Web site that is designed to exploit this vulnerability through Internet Explorer and then convince a user to view the Web site. The attacker could also take advantage of compromised Web sites and Web sites that accept or host user-provided content or advertisements. These Web sites could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger message that takes users to the attacker's Web site. It could also be possible to display specially crafted Web content by using banner advertisements or by using other methods to deliver Web content to affected systems.
What systems are primarily at risk from the vulnerability?
This vulnerability requires that a user be logged on and visiting a Web site for any malicious action to occur. Therefore, any systems where Internet Explorer is used frequently, such as workstations or terminal servers, are at the most risk from this vulnerability.
What does the update do?
The update modifies the way that Internet Explorer handles objects in memory.
When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through responsible disclosure.
When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.
Other Information
Acknowledgments
Microsoft thanks the following for working with us to help protect customers:
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Ryan Smith of Verisign IDefense Labs for reporting the ATL COM Initialization Vulnerability (CVE-2009-2493)
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Sam Thomas of eshu.co.uk, working with TippingPoint and the Zero Day Initiative, for reporting the Uninitialized Memory Corruption Vulnerability (CVE-2009-3671)
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team509, working with Verisign IDefense Labs, for reporting the HTML Object Memory Corruption Vulnerability (CVE-2009-3672)
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An anonymous researcher, working with TippingPoint and the Zero Day Initiative, for reporting the Uninitialized Memory Corruption Vulnerability (CVE-2009-3673)
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An anonymous researcher, working with TippingPoint and the Zero Day Initiative, for reporting the Uninitialized Memory Corruption Vulnerability (CVE-2009-3674)
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Microsoft Active Protections Program (MAPP)
To improve security protections for customers, Microsoft provides vulnerability information to major security software providers in advance of each monthly security update release. Security software providers can then use this vulnerability information to provide updated protections to customers via their security software or devices, such as antivirus, network-based intrusion detection systems, or host-based intrusion prevention systems. To determine whether active protections are available from security software providers, please visit the active protections Web sites provided by program partners, listed in Microsoft Active Protections Program (MAPP) Partners.
Support
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Customers in the U.S. and Canada can receive technical support from Security Support or 1-866-PCSAFETY. There is no charge for support calls that are associated with security updates. For more information about available support options, see Microsoft Help and Support.
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International customers can receive support from their local Microsoft subsidiaries. There is no charge for support that is associated with security updates. For more information about how to contact Microsoft for support issues, visit the International Support Web site.
Disclaimer
The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Revisions
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V1.0 (December 8, 2009): Bulletin published.
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