11 December 2013
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2013.1781 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: http://technet.microsoft.com/en-us/security/advisory/2905247 - --------------------------BEGIN INCLUDED TEXT-------------------- 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to email@example.com and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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