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. Recommendation. Customers can configure automatic updating to check online for updates from Microsoft Update by using the Microsoft Update service. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information.
The update addresses the vulnerabilities by correcting the way that Microsoft Excel manages data structures, validates record information, initializes variables used in memory operations, and allocates buffer space when parsing a specially crafted file. For more information, see the subsection, Affected and Non-Affected Software, in this section. This security update is rated Important for all supported editions of Microsoft Excel 2002, Microsoft Excel 2003, Microsoft Excel 2007, Microsoft Excel 2010, Microsoft Office 2004 for Mac, Microsoft Office 2008 for Mac, and Microsoft Office for Mac 2011 Open XML File Format Converter for Mac and all supported versions of Microsoft Excel Viewer and Microsoft Office Compatibility Pack. 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. An attacker who successfully exploited any of these vulnerabilities could gain the same user rights as the logged-on user. The vulnerabilities could allow remote code execution if a user opens a specially crafted Excel file. This security update resolves nine privately reported vulnerabilities in Microsoft Office.
Version: 1.0 General Information Executive Summary
Security Bulletin Microsoft Security Bulletin MS11-021 - Important Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (2489279)
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