Microsoft Security Bulletin MS11-096 - Important
Vulnerability in Microsoft Excel Could Allow Remote Code Execution (2640241)
Published: | Updated:
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 Excel 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. Installing and configuring Office File Validation (OFV) to prevent the opening of suspicious files blocks the attack vectors for exploiting the vulnerabilities described in CVE-2011-3403. See the section, Frequently Asked Questions (FAQ) Related to This Security Update, for more information about how the Office File Validation feature can be configured to block the attack vectors.
This security update is rated Important for all supported editions of Microsoft Excel 2003 and Microsoft Office 2004 for Mac. 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 Excel manages objects in memory. 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. Microsoft Knowledge Base Article 2640241 documents the currently known issues that customers may experience when installing this security update. The article also documents recommended solutions for these issues.
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.
|Microsoft Office Suite and Other Software||Component||Maximum Security Impact||Aggregate Severity Rating||Bulletins Replaced by this Update|
|Microsoft Office Suites and Components|
|Microsoft Office 2003 Service Pack 3||Microsoft Excel 2003 Service Pack 3|
|Remote Code Execution||Important||MS11-072|
|Microsoft Office for Mac|
|Microsoft Office 2004 for Mac|
|Not applicable||Remote Code Execution||Important||MS11-072|
|Office and Other Software|
|Microsoft Excel 2007 Service Pack 2 and Microsoft Excel 2007 Service Pack 3|
|Microsoft Excel 2010 and Microsoft Excel 2010 Service Pack 1 (32-bit editions)|
|Microsoft Excel 2010 and Microsoft Excel 2010 Service Pack 1 (64-bit editions)|
|Microsoft Office 2008 for Mac|
|Microsoft Office for Mac 2011|
|Open XML File Format Converter for Mac|
|Microsoft Excel Viewer Service Pack 2|
|Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Service Pack 2|
|Microsoft Office Compatibility Pack Service Pack 3|
|Microsoft Excel Web App 2010 and Microsoft Excel Web App 2010 Service Pack 1|
|Microsoft Works 9|
Microsoft thanks the following for working with us to help protect customers:
- An anonymous researcher, working with VeriSign iDefense Labs, for reporting the Record Memory Corruption Vulnerability (CVE-2011-3403)
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.
- 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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- V1.0 (December 13, 2011): Bulletin published.
- V1.1 (December 21, 2011): Added Microsoft Office Compatibility Pack Service Pack 3 to the Non-Affected Software table. This is an informational change only. There were no changes to the detection logic or the update files.