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SecurityvulnsSECURITYVULNS:DOC:11433

HistoryFeb 15, 2006 - 12:00 a.m.

Microsoft Security Bulletin MS06-004 Cumulative Security Update for Internet Explorer (910620)

2006-02-1500:00:00

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Microsoft Security Bulletin MS06-004
Cumulative Security Update for Internet Explorer (910620)
Published: February 14, 2006

Version: 1.0
Summary

Who should read this document: Customers who use Microsoft Windows

Impact of Vulnerability: Remote Code Execution

Maximum Severity Rating: Critical

Recommendation: Customers should apply the update immediately.

Security Update Replacement: This update replaces the update that is included with Microsoft Security Bulletin MS05-054. That update is also a cumulative update.

Caveats: Microsoft Knowledge Base Article 910620 documents the currently known issues that customers may experience when they install this security update. The article also documents recommended solutions for these issues. For more information, see Microsoft Knowledge Base Article 910620.

This update does include hotfixes that have been released since the release of MS04-004 and MS04-025, but they will only be installed on systems that need them. Customers who have received hotfixes from Microsoft or from their support providers since the release of MS04-004 or MS04-025 should review the “I have received a hotfix from Microsoft or my support provider since the release of MS04-004. Is that hotfix included in this security update?” question in the FAQ section of this bulletin to determine how you can make sure that the necessary hotfixes are installed. Microsoft Knowledge Base Article 910620 also documents this in more detail.

Tested Software and Security Update Download Locations:

Affected Software:
•

Microsoft Windows 2000 Service Pack 4

Non-Affected Software:
•

Microsoft Windows XP Service Pack 1 and Microsoft Windows XP Service Pack 2
•

Microsoft Windows XP Professional x64 Edition
•

Microsoft Windows Server 2003 and Microsoft Windows Server 2003 Service Pack 1
•

Microsoft Windows Server 2003 for Itanium-based Systems and Microsoft Windows Server 2003 with Service Pack 1 for Itanium-based Systems
•

Microsoft Windows Server 2003 x64 Edition family
•

Microsoft Windows 98, Microsoft Windows 98 Second Edition (SE), and Microsoft Windows Millennium Edition (ME) – Review the FAQ section of this bulletin for details about these operating systems.

Note The bullet points for Microsoft Windows Server 2003, Microsoft Windows Server 2003 Service Pack 1, and Microsoft Windows Server 2003 x64 Edition also apply to Microsoft Windows Server 2003 R2.

Tested Microsoft Windows Components:

Affected Components:
•

Internet Explorer 5.01 Service Pack 4 on Microsoft Windows 2000 Service Pack 4 – Download the update

The software in this list has been tested to determine whether the versions are affected. Other versions either no longer include security update support or may not be affected. To determine the support life cycle for your product and version, visit the Microsoft Support Lifecycle Web site.
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General Information

Executive Summary

Executive Summary:

This update resolves a newly-discovered, public vulnerability. The vulnerability is documented in the "Vulnerability Details" section of this bulletin.

If a user is logged on with administrative user rights, an attacker who successfully exploited the 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.

We recommend that customers apply the update immediately.

Severity Ratings and Vulnerability Identifiers:
Vulnerability Identifiers Impact of Vulnerability Internet Explorer 5.01 Service Pack 4 Internet Explorer 6 Service Pack 1 (All supported operating system versions earlier than Windows Server 2003) Internet Explorer 6 for Windows Server 2003 and Windows Server 2003 Service Pack 1 Internet Explorer 6 for Windows XP Service Pack 2

WMF Image Parsing Memory Corruption Vulnerability - CVE-2006-0020

Remote Code Execution

Critical

None

This assessment is based on the types of systems that are affected by the vulnerability, their typical deployment patterns, and the effect that exploiting the vulnerability would have on them.

Note The severity ratings for non-x86 operating system versions map to the x86 operating systems versions as follows:
•

The Internet Explorer 6 for Windows XP Professional x64 Edition severity rating is the same as the Internet Explorer 6 Service Pack 1 (All supported operating system versions earlier than Windows Server 2003) severity rating. Therefore it also has a severity rating of “None”.
•

The Internet Explorer 6 for Microsoft Windows Server 2003 for Itanium-based Systems and Windows Server 2003 x64 Edition severity rating is the same as the Internet Explorer 6 for Windows Server 2003 severity rating. Therefore they also have a severity rating of “None”.
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Frequently asked questions (FAQ) related to this security update

What updates does this release replace?
This security update replaces several prior security updates. The most recent security bulletin ID and affected operating systems are listed in the following table.
Bulletin ID Internet Explorer 5.01 Service Pack 4 Internet Explorer 6 Service Pack 1 (all versions earlier than Windows Server 2003) Internet Explorer 6 for Windows Server 2003 (including 64-Bit Edition) Internet Explorer 6 for Windows XP Service Pack 2

MS05-054

Replaced

Not applicable

What are the known issues that customers may experience when they install this security update?
Microsoft Knowledge Base Article 910620 documents the currently known issues that customers may experience when they install this security update. The article also documents recommended solutions for these issues. For more information, see Microsoft Knowledge Base Article 910620.

I have received a hotfix from Microsoft or my support provider since the release of MS04-004. Is that hotfix included in this security update?
Yes. For Internet Explorer 5.01 Service Pack 4, Internet Explorer 5.5 Service Pack 2, and Windows 2000 Service Pack 4, the MS06-004 security updates contain hotfixes that were included after MS04-004 up to and including the cumulative updates in MS06-004. The hotfix versions of the files that are included in this security update are installed regardless of whether you have previously installed an Internet Explorer hotfix to update any of the files that are listed in the “Security Update Information” section of this bulletin.

Does this update contain any security-related changes to functionality?
Yes. Besides the changes that are listed in the “Vulnerability Details” section of this bulletin, also included are security-related changes that were introduced in previous Internet Explorer bulletins.

Does this update contain any other changes to functionality?
Yes. Besides the changes that are listed in the “Vulnerability Details” section of this bulletin, also included are non-security-related changes that were introduced in previous Internet Explorer bulletins.

How does the extended support for Windows 98, Windows 98 Second Edition, and Windows Millennium Edition affect the release of security updates for these operating systems?
Microsoft will only release security updates for critical security issues. Non-critical security issues are not offered during this support period. For more information about the Microsoft Support Lifecycle policies for these operating systems, visit the following Web site.

For more information about severity ratings, visit the following Web site.

Are Windows 98, Windows 98 Second Edition, or Windows Millennium Edition critically affected by the vulnerability that is addressed in this security bulletin?
No. This vulnerability does not exist on Windows 98, on Windows 98 Second Edition, or on Windows Millennium Edition with Internet Explorer 6 Service Pack 1, which is the only supported version of Internet Explorer on these versions of Windows. For more information about severity ratings, visit the following Web site. Microsoft will provide security updates on the operating systems that are affected and the severity rating is critical through June 30, 2006. It should be a priority for customers who have these operating system versions to migrate to supported versions to prevent potential exposure to vulnerabilities. For more information about the Windows Product Lifecycle, visit the following Microsoft Support Lifecycle Web site.

What about Internet Explorer 5.5 Service Pack 2 on Windows Millennium Edition?
Internet Explorer 5.5 Service Pack 2 on Windows Millennium Edition has reached the end of its life cycle. It should be a priority for customers who have this Internet Explorer version to migrate to Internet Explorer 6 Service Pack 1 to prevent potential exposure to vulnerabilities. For more information about the Windows Product Lifecycle, visit the following Microsoft Support Lifecycle Web site. For specific support dates for Internet Explorer 5.5 Service Pack 2 on Windows Millennium Edition, visit the following Microsoft Support Lifecycle Web site.

When you released the security advisory you stated that Internet Explorer 5.5 Service Pack 2 on Windows Millennium Edition was affected by this vulnerability. What should I do?
As Internet Explorer 5.5 Service Pack 2 on Windows Millennium Edition has reached the end of its life cycle you should migrate to Internet Explorer 6 Service Pack 1 to prevent potential exposure to vulnerabilities, including this vulnerability.

Pack 6a and Windows 2000 Service Pack 2 ended on June 30, 2004. Extended security update support for Microsoft Windows NT Server 4.0 Service Pack 6a ended on December 31, 2004. Extended security update support for Microsoft Windows 2000 Service Pack 3 ended on June 30, 2005. I’m still using one of these operating systems, what should I do?
Windows NT Workstation 4.0 Service Pack 6a, Windows NT Server 4.0 Service Pack 6a, Windows 2000 Service Pack 2, and Windows 2000 Service Pack 3 have reached the end of their life cycles. It should be a priority for customers who have these operating system versions to migrate to supported versions to prevent potential exposure to vulnerabilities. For more information about the Windows Product Lifecycle, visit the following Microsoft Support Lifecycle Web site. For more information about the extended security update support period for these operating system versions, visit the Microsoft Product Support Services Web site.

Customers who require additional support for Windows NT 4.0 SP6a and Windows 2000 Service Pack 3 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, 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 Windows Operating System Product Support Lifecycle FAQ.

Can I use the Microsoft Baseline Security Analyzer (MBSA) 1.2.1 to determine whether this update is required?
Yes. MBSA 1.2.1 will determine whether this update is required. MBSA only supports workstation-class operating systems such as Windows 2000 and higher. For more information about MBSA, visit the MBSA Web site.

Can I use the Microsoft Baseline Security Analyzer (MBSA) 2.0 to determine whether this update is required?
Yes. MBSA 2.0 will determine whether this update is required. MBSA 2.0 can detect security updates for products that Microsoft Update supports. MBSA only supports workstation-class operating systems such as Windows 2000 and higher. For more information about MBSA, visit the MBSA Web site.

Can I use Systems Management Server (SMS) to determine whether this update is required?
Yes. SMS can help detect and deploy this security update. For information about SMS, visit the SMS Web site.

The Security Update Inventory Tool can be used by SMS for detecting security updates that are offered by Windows Update, that are supported by Software Update Services, and other security updates that are supported by MBSA 1.2.1. For more information about the Security Update Inventory Tool, see the following Microsoft Web site. For more information about the limitations of the Security Update Inventory Tool, see Microsoft Knowledge Base Article 306460.

The SMS 2003 Inventory Tool for Microsoft Updates can be used by SMS for detecting security updates that are offered by Microsoft Update and that are supported by Windows Server Update Services. For more information about the SMS 2003 Inventory Tool for Microsoft Updates, see the following Microsoft Web site.

For more information about SMS, visit the SMS Web site.
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Vulnerability Details

WMF Image Parsing Memory Corruption Vulnerability - CVE-2006-0020:

A remote code execution vulnerability exists in Internet Explorer because of the way that it handles Windows Metafile (WMF) images. An attacker could exploit the vulnerability by constructing a specially crafted WMF image that could potentially allow remote code execution if a user visited a malicious Web site, opened or previewed an e-mail message, or opened a specially crafted attachment in e-mail. An attacker who successfully exploited this vulnerability could take complete control of an affected system.

Note that this vulnerability in Internet Explorer is separate from the vulnerabilities addressed in Windows in MS05-053 and MS06-001.

Mitigating Factors for WMF Image Parsing Memory Corruption Vulnerability - CVE-2006-0020:
•

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. Also, Web sites that accept or host user-provided content or advertisements, and compromised Web sites, may contain malicious 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 persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger request that takes users to the attacker’s Web site.
•

In an e-mail based attack of this exploit, customers would have to open a malicious e-mail message, preview a malicious e-mail message in the Outlook Express preview pane, click on a link that would take them to a malicious Web site, or open an attachment that could exploit the vulnerability. Users can disable the preview pane in Outlook Express and delete the suspicious e-mail message without opening the e-mail message. 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.
•

In an e-mail based attack of this exploit, customers would have to open a malicious e-mail message, preview a malicious e-mail message in the Outlook preview pane, click on a link that would take them to a malicious Web site, or open an attachment that could exploit the vulnerability. Users can disable the preview pane in Outlook and delete the suspicious e-mail message without opening the e-mail message. Customers who read e-mail in plain text in Outlook would have to click on a link that would take them to a malicious Web site, or open an attachment to be at risk from this vulnerability.
•

Customers who have installed Internet Explorer 6 Service Pack 1 are not affected by this vulnerability and are also not affected by exploits attempting to utilize this vulnerability using the e-mail mail vector.
•

Internet Explorer 6 Service Pack 1 is the only supported version for Windows 98, Windows 98 Second Edition, and Windows Millennium.
•

This issue does not affect Windows XP Service Pack 1, Windows XP Service Pack 2, Windows XP Professional x64 Edition, Windows Server 2003, Windows Server 2003 Service Pack 1, Windows Server 2003 for Itanium-based Systems, Windows Server 2003 with Service Pack 1 for Itanium-based Systems, or Windows Server 2003 x64 Edition. These Windows versions include Internet Explorer 6 Service Pack 1 or later versions.
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Workarounds for WMF Image Parsing Memory Corruption Vulnerability - CVE-2006-0020:

No workarounds have been identified for this vulnerability.

Customers using Windows 2000 Service pack 4 with Internet Explorer 5.01 Service Pack 4 are strongly encouraged to apply the update or install Internet Explorer 6 Service Pack 1.
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FAQ for WMF Image Parsing Memory Corruption Vulnerability - CVE-2006-0020:

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could remotely 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?
When Internet Explorer displays a Web page that contains a specially crafted WMF image, system memory may be corrupted in such a way that an attacker could execute arbitrary code.

What is the Windows Metafile (WMF) image format?
A Windows Metafile (WMF) image is a 16-bit metafile format that can contain both vector information and bitmap information. It is optimized for the Windows operating system.

For more information about image types and formats, see Microsoft Knowledge Base Article 320314 or visit the MSDN Library Web site.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could take complete control of the affected system.

How could an attacker exploit the vulnerability by posting a specially crafted WMF image on a Web site?
An attacker could host a malicious Web site that is designed to exploit this vulnerability through Internet Explorer and then persuade a user to view the Web site. This can also include Web sites that accept user-provided content or advertisements, Web sites that host user-provided content or advertisements, and compromised Web sites. These Web sites could contain malicious Windows Metafile (WMF) images 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 persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or in an Instant Messenger request 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.

Could this vulnerability be exploited through other vectors?
Yes. An attacker could, for example, embed a specially crafted WMF image in an e-mail message.

What systems are primarily at risk from the vulnerability?
This vulnerability requires that a user is logged on and visits 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 removes the vulnerability by modifying the way that Internet Explorer validates the length of a message before it passes the message to the allocated buffer.

Does this vulnerability affect image formats other than Windows Metafile (WMF)?
The only image format affected is the Windows Metafile (WMF) format. It is possible, however, that an attacker could rename the file name extension of a WMF file to that of a different image format. In this situation, Internet Explorer could detect and render the file as a WMF image by using its MIME type detection functionality, which could allow exploitation.

Users can block file types by extension to provide additional defense in depth safeguards. However, it is important for content filtering to be performed on file headers that are associated with content downloaded from the Internet or that are received in e-mail messages.

If I block .wmf images by extension, can this protect me against attempts to exploit this vulnerability?
No. Internet Explorer does not determine file types by the file name extensions that they use. Therefore, if an attacker alters the file name extension of a WMF image, Internet Explorer could still render the file in a way that could exploit the vulnerability.

Is this issue related to Microsoft Security Bulletin MS05-053 - Vulnerabilities in Graphics Rendering Engine Could Allow Code Execution (896424), which was released in November 2005?
No, these are different and separate issues.

Is this issue related to Microsoft Security Bulletin MS06-001 - Vulnerabilities in Graphics Rendering Engine Could Allow Code Execution (912919), which was released in January 2006?
No, these are different and separate issues.

Is this issue related to a public posting discussing specially crafted WMF images that could potentially cause the application using the Windows Graphics Rendering Engine to crash?
No, these are different and separate issues. That posting has been discussed in the Microsoft Security Response Center Blog

What versions of Internet Explorer are affected by this vulnerability?
The vulnerability exists in Internet Explorer 5.01 Service Pack 4 on Windows 2000.

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-2006-0020.

When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had seen examples of proof of concept code published publicly but had not received any information to indicate that this vulnerability had been publicly used to attack customers when this security bulletin was originally issued.
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Security Update Information

Affected Software:

For information about the specific security update for your affected software, click the appropriate link:

Internet Explorer 5.01 Service Pack 4 on Windows 2000 (all versions)

Prerequisites
For Windows 2000, this security update requires Service Pack 4 (SP4). For Small Business Server 2000, this security update requires Small Business Server 2000 Service Pack 1a (SP1a) or Small Business Server 2000 running with Windows 2000 Server Service Pack 4 (SP4).

The software that is listed has been tested to determine whether the versions are affected. Other versions either no longer include security update support or may not be affected. To determine the support life cycle for your product and version, visit the Microsoft Support Lifecycle Web site.

For more information about how to obtain the latest service pack, see Microsoft Knowledge Base Article 260910.

Inclusion in Future Service Packs:
The update for this issue may be included in a future Update Rollup.

Installation Information

This security update supports the following setup switches.
Supported Security Update Installation Switches
Switch Description

/help

Displays the command-line options
Setup Modes

/passive

Unattended Setup mode. No user interaction is required, but installation status is displayed. If a restart is required at the end of Setup, a dialog box will be presented to the user with a timer warning that the computer will restart in 30 seconds.

/quiet

Quiet mode. This is the same as unattended mode, but no status or error messages are displayed.
Restart Options

/norestart

Does not restart when installation has completed

/forcerestart

Restarts the computer after installation and force other applications to close at shutdown without saving open files first.

/warnrestart[:x]

Presents a dialog box with a timer warning the user that the computer will restart in x seconds. (The default setting is 30 seconds.) Intended for use with the /quiet switch or the /passive switch.

/promptrestart

Display a dialog box prompting the local user to allow a restart
Special Options

/overwriteoem

Overwrites OEM files without prompting

/nobackup

Does not back up files needed for uninstall

/forceappsclose

Forces other programs to close when the computer shuts down

/log:path

Allows the redirection of installation log files

/extract[:path]

Extracts files without starting the Setup program

/ER

Enables extended error reporting

/verbose

Enables verbose logging. During installation, creates %Windir%\CabBuild.log. This log details the files that are copied. Using this switch may cause the installation to proceed more slowly.

Note You can combine these switches into one command. For backward compatibility, the security update also supports the setup switches that the earlier version of the Setup program uses. For more information about the supported installation switches, see Microsoft Knowledge Base Article 262841. For more information about the Update.exe installer, visit the Microsoft TechNet Web site. For more information about the terminology that appears in this bulletin, such as hotfix, see Microsoft Knowledge Base Article 824684.

Deployment Information

To install the security update without any user intervention, use the following command at a command prompt for Windows 2000 Service Pack 4:

IE5.01sp4-KB910620-Windows2000sp4-x86-enu /quiet

Note Use of the /quiet switch will suppress all messages. This includes suppressing failure messages. Administrators should use one of the supported methods to verify the installation was successful when they use the /quiet switch. Administrators should also review the KB910620-IE501SP4-20060112.143924.log file for any failure messages when they use this switch.

To install the security update without forcing the system to restart, use the following command at a command prompt for Windows 2000 Service Pack 4:

IE5.01sp4-KB910620-Windows2000sp4-x86-enu /norestart

For more information about how to deploy this security update with Software Update Services, visit the Software Update Services Web site. For more information about how to deploy this security update using Windows Server Update Services, visit the Windows Server Update Services Web site. This security update will also be available through the Microsoft Update Web site.

Restart Requirement

You must restart your system after you apply this security update.

Removal Information

To remove this security update, use the Add or Remove Programs tool in Control Panel.

System administrators can also use the Spuninst.exe utility to remove this security update. The Spuninst.exe utility is located in the %Windir%\$NTUninstallKB910620-IE501SP4-20060112.143924$\Spuninst folder.
Supported Spuninst.exe Switches
Switch Description

/help

Displays the command-line options
Setup Modes

/passive

/quiet

Quiet mode. This is the same as unattended mode, but no status or error messages are displayed.
Restart Options

/norestart

Does not restart when installation has completed

/forcerestart

Restarts the computer after installation and force other applications to close at shutdown without saving open files first.

/warnrestart[:x]

Presents a dialog box with a timer warning the user that the computer will restart in x seconds. (The default setting is 30 seconds.) Intended for use with the /quiet switch or the /passive switch.

/promptrestart

Display a dialog box prompting the local user to allow a restart
Special Options

/forceappsclose

Forces other programs to close when the computer shuts down

/log:path

Allows the redirection of installation log files

File Information

The English version of this security update has the file attributes that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Windows 2000 Service Pack 4 and Small Business Server 2000:
File Name Version Date Time Size

Browseui.dll

5.0.3828.2700

27-Apr-2005