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MS11-028 - Critical : Vulnerability in .NET Framework Could Allow Remote Code Execution (2484015) - Version: 2.4

Posted on 01 December 2011

Critical

Severity Rating: Critical
Revision Note: V2.4 (November 30, 2011): Corrected the bulletin replacement information for .NET Framework 4 on Windows 7 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1, and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1. This is a bulletin change only. There were no changes to the detection or security update files.
Summary: This security update resolves a publicly disclosed vulnerability in Microsoft .NET Framework. The vulnerability could allow remote code execution on a client system if a user views a specially crafted Web page using a Web browser that can run XAML Browser Applications (XBAPs). 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. The vulnerability could also allow remote code execution on a server system running IIS, if that server allows processing ASP.NET pages and an attacker succeeds in uploading a specially crafted ASP.NET page to that server and then executes the page, as could be the case in a Web hosting scenario. This vulnerability could also be used by Windows .NET applications to bypass Code Access Security (CAS) restrictions.

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