MS11-089: Vulnerability in Microsoft Office Could Allow Remote Code Execution (2590602)

This security update resolves a privately reported vulnerability in Microsoft Office.

Microsoft Security Bulletin MS11-089 - Important
Vulnerability in Microsoft Office Could Allow Remote Code Execution (2590602)
Published: Tuesday, December 13, 2011

Version: 1.0

General Information
Executive Summary
This security update resolves a privately reported vulnerability in Microsoft Office. The vulnerability could allow remote code execution if a user opens a specially crafted Word file. 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.

This security update is rated Important for all supported editions of Microsoft Office 2007, Microsoft Office 2010, and Microsoft Office for Mac 2011. For more information, see the subsection, Affected and Non-Affected Software, in this section.

The security update addresses the vulnerability by correcting the way that Microsoft Word parses specially crafted Word files. 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. Customers can configure automatic updating to check online for updates from Microsoft Update by using the Microsoft Update service. Customers who have automatic updating enabled and configured to check online for updates from Microsoft Update typically 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 from Microsoft Update and install this update manually. For information about specific configuration options in automatic updating in supported editions of Windows XP and Windows Server 2003, see Microsoft Knowledge Base Article 294871. For information about automatic updating in supported editions of Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2, see Understanding Windows automatic updating.

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

Microsoft Office Suite and Other Software    Maximum Security Impact    Aggregate Severity Rating    Bulletins Replaced by this Update
Microsoft Office Suites and Components
Microsoft Office 2007 Service Pack 2 and Microsoft Office 2007 Service Pack 3
(KB2596785)    Remote Code Execution    Important    None
Microsoft Office 2010 and Microsoft Office 2010 Service Pack 1 (32-bit editions)
(KB2589320)    Remote Code Execution    Important    None
Microsoft Office 2010 and Microsoft Office 2010 Service Pack 1 (64-bit editions)
(KB2589320)    Remote Code Execution    Important    None
Microsoft Office for Mac
Microsoft Office for Mac 2011
(KB2644347)    Remote Code Execution    Important    MS11-072
Non-Affected Software

Office and Other Software
Microsoft Office 2003 Service Pack 3
Microsoft Office 2004 for Mac
Microsoft Office 2008 for Mac
Open XML File Format Converter for Mac
Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2 and Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 3
Microsoft Office Word Viewer
Microsoft Works 9
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Frequently Asked Questions (FAQ) Related to This Security Update
Vulnerability Information
Severity Ratings and Vulnerability Identifiers
Word Use After Free Vulnerability - CVE-2011-1983
A remote code execution vulnerability exists in the way that Microsoft Word handles specially crafted Word files. 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-2011-1983.

Mitigating Factors for Word Use After Free Vulnerability - CVE-2011-1983
Workarounds for Word Use After Free Vulnerability - CVE-2011-1983
FAQ for Word Use After Free Vulnerability - CVE-2011-1983
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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:

Nikita Tarakanov (CISS Research Team) and Alexey Sintsov (Digital Security Research Group), working with TippingPoint's Zero Day Initiative, for reporting the Word Use After Free Vulnerability (CVE-2011-1983)
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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 (December 13, 2011): Bulletin published.
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