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From:MICROSOFT <secure_(at)_microsoft.com>
Date:13.10.2010
Subject:Microsoft Security Bulletin MS10-081 - Important Vulnerability in Windows Common Control Library Could Allow Remote Code Execution (2296011)

Microsoft Security Bulletin MS10-081 - Important
Vulnerability in Windows Common Control Library Could Allow Remote Code Execution (2296011)
Published: October 12, 2010

Version: 1.0
General Information
Executive Summary

This security update resolves a privately reported vulnerability in the Windows common control library. The vulnerability could allow remote code execution if a user visited a specially crafted Web page. 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.

This security update is rated Important for all supported releases of Microsoft Windows. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerability by correcting the manner in which the Windows common controls handle messages passed from a third-party scalable vector graphics (SVG) viewer. For more information about the vulnerability, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.

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 at the earliest opportunity 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 following software 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 Maximum Security Impact Aggregate Severity Rating Bulletins Replaced by this Update

Windows XP Service Pack 3


Remote Code Execution


Important


None

Windows XP Professional x64 Edition Service Pack 2


Remote Code Execution


Important


None

Windows Server 2003 Service Pack 2


Remote Code Execution


Important


None

Windows Server 2003 x64 Edition Service Pack 2


Remote Code Execution


Important


None

Windows Server 2003 with SP2 for Itanium-based Systems


Remote Code Execution


Important


None

Windows Vista Service Pack 1 and Windows Vista Service Pack 2


Remote Code Execution


Important


None

Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2


Remote Code Execution


Important


None

Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2**


Remote Code Execution


Important


None

Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2**


Remote Code Execution


Important


None

Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2


Remote Code Execution


Important


None

Windows 7 for 32-bit Systems


Remote Code Execution


Important


None

Windows 7 for x64-based Systems


Remote Code Execution


Important


None

Windows Server 2008 R2 for x64-based Systems**


Remote Code Execution


Important


None

Windows Server 2008 R2 for Itanium-based Systems


Remote Code Execution


Important


None

**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 TechNet articles, Managing a Server Core Installation and Servicing a Server Core Installation. 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

Where are the file information details?
Refer to the reference tables in the Security Update Deployment section for the location of the file information details.

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 October bulletin summary. For more information, see Microsoft Exploitability Index.
Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software Comctl32 Heap Overflow Vulnerability - CVE-2010-2746 Aggregate Severity Rating

Windows XP Service Pack 3


Important
Remote Code Execution


Important

Windows XP Professional x64 Edition Service Pack 2


Important
Remote Code Execution


Important

Windows Server 2003 Service Pack 2


Important
Remote Code Execution


Important

Windows Server 2003 x64 Edition Service Pack 2


Important
Remote Code Execution


Important

Windows Server 2003 with SP2 for Itanium-based Systems


Important
Remote Code Execution


Important

Windows Vista Service Pack 1 and Windows Vista Service Pack 2


Important
Remote Code Execution


Important

Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition Service Pack 2


Important
Remote Code Execution


Important

Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2**


Important
Remote Code Execution


Important

Windows Server 2008 for x64-based Systems and Windows Server 2008 for x64-based Systems Service Pack 2**


Important
Remote Code Execution


Important

Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2


Important
Remote Code Execution


Important

Windows 7 for 32-bit Systems


Important
Remote Code Execution


Important

Windows 7 for x64-based Systems


Important
Remote Code Execution


Important

Windows Server 2008 R2 for x64-based Systems**


Important
Remote Code Execution


Important

Windows Server 2008 R2 for Itanium-based Systems


Important
Remote Code Execution


Important

**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 TechNet articles, Managing a Server Core Installation and Servicing a Server Core Installation. 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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Comctl32 Heap Overflow Vulnerability - CVE-2010-2746

A remote code execution vulnerability exists in the way that the Windows common control library renders specially crafted Web sites when using a third-party scalable vector graphics (SVG) viewer. This vulnerability could allow code execution if a user visited a specially crafted Web page. 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.

To view this vulnerability as a standard entry in the Common Vulnerabilities and Exposures list, see CVE-2010-2746.

Mitigating Factors for Comctl32 Heap Overflow Vulnerability - CVE-2010-2746

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.


This vulnerability cannot be exploited in the default Windows configuration. In order to be vulnerable to the issue, a third-party application that renders scalable vector graphics (SVG) must be installed on the system.
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Workarounds for Comctl32 Heap Overflow Vulnerability - CVE-2010-2746

Microsoft has not identified any workarounds for this vulnerability.
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FAQ for Comctl32 Heap Overflow Vulnerability - CVE-2010-2746

What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who successfully exploited this vulnerability could run arbitrary code with elevated privileges on vulnerable systems. An attacker could then install programs or view, change, or delete data; or create new accounts with full user rights.

What causes the vulnerability?
The Windows common control library does not properly handle certain messages when rendering scalable vector graphics passed from a third-party scalable vector graphics (SVG) viewer.

What are the Windows Common Control Libraries?
The common controls are a set of windows that are implemented by the common control library, Comctl32.dll, which is a DLL included with the Windows operating system. Like other control windows, a common control is a child window that an application uses in conjunction with another window to enable interaction with the user. For further information about these libraries, see MSDN article, About Common Controls.

Can this issue be exploited in the default Windows configuration?
No. In order to be vulnerable to the issue, a third-party application that renders scalable vector graphics (SVG) must be installed on the system. Microsoft has not determined any attack vector without this third-party viewer being installed on the system. For a list of SVG implementations, refer to the World Wide Web Consortium (W3C) list of SVG Implementations.

What are Scalable Vector Graphics?
Scalable Vector Graphics (SVG) is a standard for authoring and deploying two-dimensional vector graphics using XML documents. It is a World Wide Web Consortium (W3C) recommendation that has been authored and endorsed by a number of industry organizations. An SVG is, at its core, an XML document conforming to the schema defined as a part of the SVG ratification process. Defined in the specification is a variety of basic geometric shapes such as rectangles, circles, ellipses, lines, polylines, polygons, and glyph elements such as text. More complex shapes can be created by using the path element, allowing you to define shapes as a sequence of lines, arcs, and complex Bezier curves. Using these basic shapes, along with a bit of ingenuity, even the most complex geometric constructions can be created.

What might an attacker use the vulnerability to do?
If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability 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 a Web browser and then convince a user to view the Web site. This can also include 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 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.

What systems are primarily at risk from the vulnerability?
Workstations and terminal servers are primarily at risk. Servers could be at more risk if administrators allow users to log on to servers and to run programs. However, best practices strongly discourage allowing this.

What does the update do?
The update addresses this vulnerability by correcting the manner in which the Windows common control library handles certain messages passed from a third-party scalable vector graphics (SVG) viewer.

When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through coordinated vulnerability 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 when this security bulletin was originally issued.

Other Information
Acknowledgments

Microsoft thanks the following for working with us to help protect customers:


Krystian Kloskowski (h07), working with Secunia, for reporting the Comctl32 Heap Overflow Vulnerability (CVE-2010-2746)
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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


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.


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


V1.0 (October 12, 2010): Bulletin published.

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