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Microsoft Security Bulletin MS11-085 - Important
Vulnerability in Windows Mail and Windows Meeting Space Could Allow Remote Code Execution (2620704)

Published: Tuesday, November 08, 2011

Version: 1.0
General Information
Executive Summary

This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if a user opens a legitimate file (such as an .eml or .wcinv file) that is located in the same network directory as a specially crafted dynamic link library (DLL) file. Then, while opening the legitimate file, Windows Mail or Windows Meeting Space could attempt to load the DLL file and execute any code it contained. For an attack to be successful, a user must visit an untrusted remote file system location or WebDAV share and open a legitimate file (such as an .eml or .wcinv file) from this location that is then loaded by a vulnerable application.

This security update is rated Important for all supported editions of Windows Vista; is rated Moderate for all supported editions of Windows Server 2008; and is rated Low for all supported editions of Windows 7 and Windows Server 2008 R2. 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 Windows Mail and Windows Meeting Space load external libraries. 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 Vista Service Pack 2	Remote Code Execution	Important	None
Windows Vista x64 Edition Service Pack 2	Remote Code Execution	Important	None
Windows Server 2008 for 32-bit Systems Service Pack 2**	Remote Code Execution	Moderate	None
Windows Server 2008 for x64-based Systems Service Pack 2**	Remote Code Execution	Moderate	None
Windows Server 2008 for Itanium-based Systems Service Pack 2	Remote Code Execution	Moderate	None
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1	Remote Code Execution	Low	None
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service Pack 1	Remote Code Execution	Low	None
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for x64-based Systems Service Pack 1**	Remote Code Execution	Low	None
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1	Remote Code Execution	Low	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.

Non-Affected Software
Operating System
Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
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Frequently Asked Questions (FAQ) Related to This Security Update
Vulnerability Information
Severity Ratings and Vulnerability Identifiers
Windows Mail Insecure Library Loading Vulnerability - CVE-2011-2016
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:

    Ivan Sanchez of EvilCode for reporting the Windows Mail Insecure Library Loading Vulnerability (CVE-2011-2016)

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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 (1-866-727-2338). 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 (November 8, 2011): Bulletin published.