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Security Update for .NET 4 on XP 2003 Vista Windows 7 Server 2008 Server 2008 R2 for x64 (KB2656368)

This security update resolves one privately reported vulnerability in Microsoft .NET Framework. The vulnerability could allow remote code execution on a client system if a user views a specially crafted webpage 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. In a web browsing attack scenario, an attacker could host a website that contains a webpage that is used to exploit this vulnerability. In addition, compromised websites and websites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these websites. Instead, an attacker would have to convince users to visit the website, typically by getting them to click a link in an email message or Instant Messenger message that takes users to the attacker's website.

DESCRIPTION 2656368: .NET Framework 4.0 SP0-SP0; Security Update for .NET 4 on XP 2003 Vista Windows 7 Server 2008 Server 2008 R2 for x64 (KB2656368)
IDENTIFIER 2656368[1] - MS12-025.BWP000267.BWS000371
LANGUAGE UNI
PLATFORM DOTNET_40
CATEGORY #Microsoft Patch#
SEVERITY Critical
BRAINWAREVERSION 2.0
VENDOR Microsoft
KBID 2656368
SPFROM .NET Framework 4.0 Gold
SPTO .NET Framework 4.0 Gold
PATCHTYPE Update
BULLETINID MS12-025
STATUS Legacy
UPDATEHISTORY 2012/04/11 - Patch is ready for use. Guidance: process this patch.
2012/06/19 - Delivery updated. Guidance: no need to reprocess this patch.
2013/01/17 - Legacy patch. Guidance: no need to reprocess this patch.
DATEPOSTED 2012/04/11
DATEREVISED 2013/01/17