Microsoft Security Bulletin MS13-004 - Important - Version: 2.2

Severity Rating: Important
Revision Note: V2.2 (December 16, 2013): Revised bulletin to announce a detection change to correct an offering issue for Microsoft .NET Framework 4.5 on Windows RT (2742614). This is a detection change only. There were no changes to the update files. Customers who have successfully installed the update do not need to take any action.
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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