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             AUSCERT External Security Bulletin Redistribution

  Insecure ASP.NET Site Configuration Could Allow Elevation of Privilege
                             11 December 2013


        AusCERT Security Bulletin Summary

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: 

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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 
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 

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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