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AUSCERT External Security Bulletin Redistribution
ESB-2013.1781
Insecure ASP.NET Site Configuration Could Allow Elevation of Privilege
11 December 2013
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AusCERT Security Bulletin Summary
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Product: ASP.NET
Publisher: Microsoft
Operating System: Windows XP
Windows Server 2003
Windows Vista
Windows Server 2008
Windows 7
Windows Server 2008 R2
Windows 8
Windows Server 2012
Windows RT
Impact/Access: Increased Privileges -- Remote/Unauthenticated
Resolution: Patch/Upgrade
Original Bulletin:
http://technet.microsoft.com/en-us/security/advisory/2905247
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Microsoft Security Advisory (2905247)
Insecure ASP.NET Site Configuration Could Allow Elevation of Privilege
Published: Tuesday, December 10, 2013
Version: 1.0
General Information
Executive Summary
Microsoft is announcing the availability of an update for Microsoft ASP.NET to
address a vulnerability in ASP.NET view state that exists when Machine
Authentication Code (MAC) validation is disabled through configuration
settings. The vulnerability could allow elevation of privilege and affects all
supported versions of Microsoft .NET Framework except .NET Framework 3.0
Service Pack 2 and Microsoft .NET Framework 3.5 Service Pack 1.
Any ASP.NET site for which view state MAC has become disabled through
configuration settings is vulnerable to attack. An attacker who successfully
exploited the vulnerability could use specially crafted HTTP content to inject
code to be run in the context of the service account on the ASP.NET server.
Microsoft is aware of general information available publicly that could be
used to exploit this vulnerability, but is not aware of any active attacks.
Mitigating Factors:
View state MAC is enabled by default for ASP.NET sites.
Affected Software
Windows XP Service Pack 3
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Windows 8 for 32-bit Systems
Windows 8.1 for 32-bit Systems
Windows Server 2012
Windows Server 2012 R2
Windows RT
Windows RT 8.1
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core
installation)
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2 (Server Core installation)
Suggested Actions
Apply the update for affected releases of Microsoft .NET Framework
This update is available from the Microsoft Download Center. For information
on how to manually apply the update, see Microsoft Knowledge Base Article
2905247.
For administrators and enterprise installations with web-farm scenarios
Microsoft recommends following the guidance available in Microsoft Knowledge
Base Article 2915218.
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