Severity Rating: Important
Revision Note: V2.0 (January 22, 2013): Bulletin rereleased to reoffer security update KB2756920 for Windows 7 and Windows Server 2008 R2 to systems that are running in specific configurations known to have potential compatibility issues. Customers who are reoffered the update should reinstall this update. See the update FAQ for more information.
Summary: This security update resolves four privately reported vulnerabilities in the .NET Framework. The most severe of these vulnerabilities could allow elevation of privilege if a user views a specially crafted webpage using a web browser that can run XAML Browser Applications (XBAPs). The vulnerabilities could also be used by Windows .NET applications to bypass Code Access Security (CAS) restrictions. An attacker who successfully exploited these vulnerabilities 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.
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