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Microsoft Security Bulletin MS11-077 - Important
Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Remote Code Execution (2567053)

Published: Tuesday, October 11, 2011

Version: 1.0
General Information
Executive Summary

This security update resolves four privately reported vulnerabilities in Microsoft Windows. The most severe of these vulnerabilities could allow remote code execution if a user opens a specially crafted font file (such as a .fon file) in a network share, a UNC or WebDAV location, or an e-mail attachment. For a remote attack to be successful, a user must visit an untrusted remote file system location or WebDAV share and open the specially crafted font file, or open the file as an e-mail attachment.

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 vulnerabilities by correcting the way that the Windows kernel-mode drivers validate input passed from user mode, handle the TrueType font type, allocate the proper buffer size before writing to memory, and manage kernel-mode driver objects. For more information about the vulnerabilities, 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	MS11-054
Windows XP Professional x64 Edition Service Pack 2	Remote Code Execution	Important	MS11-054
Windows Server 2003 Service Pack 2	Remote Code Execution	Important	MS11-054
Windows Server 2003 x64 Edition Service Pack 2	Remote Code Execution	Important	MS11-054
Windows Server 2003 with SP2 for Itanium-based Systems	Remote Code Execution	Important	MS11-054
Windows Vista Service Pack 2	Remote Code Execution	Important	MS11-054
Windows Vista x64 Edition Service Pack 2	Remote Code Execution	Important	MS11-054
Windows Server 2008 for 32-bit Systems Service Pack 2*	Remote Code Execution	Important	MS11-054
Windows Server 2008 for x64-based Systems Service Pack 2*	Remote Code Execution	Important	MS11-054
Windows Server 2008 for Itanium-based Systems Service Pack 2	Remote Code Execution	Important	MS11-054
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1	Remote Code Execution	Important	MS11-054
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1	Remote Code Execution	Important	MS11-054
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1*	Remote Code Execution	Important	MS11-054
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1	Remote Code Execution	Important	MS11-054

*Server Core installation affected. This update applies, with the same severity rating, to supported editions of Windows Server 2008 or Windows Server 2008 R2 as indicated, whether or not 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
Vulnerability Information
Severity Ratings and Vulnerability Identifiers
Win32k Null Pointer De-reference Vulnerability - CVE-2011-1985
Win32k TrueType Font Type Translation Vulnerability - CVE-2011-2002
Font Library File Buffer Overrun Vulnerability - CVE-2011-2003
Win32k Use After Free Vulnerability - CVE-2011-2011
Update Information
Detection and Deployment Tools and Guidance
Security Update Deployment
Other Information
Acknowledgments

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

    Andrei Lutas of BitDefender for reporting the Win32k Null Pointer De-reference Vulnerability (CVE-2011-1985)
    Tarjei Mandt of Norman for reporting the Win32k Null Pointer De-reference Vulnerability (CVE-2011-1985)
    Maik Wellmann for reporting the Win32k TrueType Font Type Translation Vulnerability (CVE-2011-2002)
    Will Dorman of the CERT/CC for reporting the Font Library File Buffer Overrun Vulnerability (CVE-2011-2003)

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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.
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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.

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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.
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Revisions

    V1.0 (October 11, 2011): Bulletin published.