Severity Rating: Important
Revision Note: V3.1 (April 24, 2013): Corrected KB article hyperlink and incorrect KB numbers for Windows 7 for x64-based Systems and Windows Server 2008 R2 for Itanium-based Systems in the Affected Software table. These are bulletin changes only.
Summary: This security update resolves three privately reported vulnerabilities and one publicly disclosed vulnerability in Microsoft Windows. The most severe of these vulnerabilities could allow elevation of privilege if an attacker logs on to the system and runs a specially crafted application. An attacker must have valid logon credentials and be able to log on locally to exploit the vulnerabilities.
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