Severity Rating: Important
Revision Note: V1.1 (January 14, 2013): Added a link to Microsoft Knowledge Base Article 2769324 under Known Issues in the Executive Summary and corrected the registry verification keys for the KB2742595 update where incorrect in this bulletin. These are informational changes only.
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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