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AUSCERT External Security Bulletin Redistribution
ESB-2012.1176
Vulnerability in IP-HTTPS Component Could Allow Security
Feature Bypass (2765809)
11 December 2012
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AusCERT Security Bulletin Summary
---------------------------------
Product: Windows
Publisher: Microsoft
Operating System: Windows Server 2008 R2
Windows Server 2012
Impact/Access: Unauthorised Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2012-2549
Original Bulletin:
http://technet.microsoft.com/en-us/security/bulletin/ms12-083
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Microsoft Security Bulletin MS12-083 - Important
Vulnerability in IP-HTTPS Component Could Allow Security Feature Bypass
(2765809)
Published Date: December 11, 2012
Version: 1.0
General Information
Executive Summary
This security update resolves a privately reported vulnerability in Microsoft
Windows. The vulnerability could allow security feature bypass if an attacker
presents a revoked certificate to an IP-HTTPS server commonly used in
Microsoft DirectAccess deployments. To exploit the vulnerability, an attacker
must use a certificate issued from the domain for IP-HTTPS server
authentication. Logging on to a system inside the organization would still
require system or domain credentials.
This security update is rated Important for all supported editions of Windows
Server 2008 R2 and Windows Server 2012.
Affected Software
Windows Server 2008 R2 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
Windows Server 2012
Windows Server 2008 R2 for x64-based Systems (Server Core installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core
installation)
Windows Server 2012 (Server Core installation)
Vulnerability Information
Revoked Certificate Bypass Vulnerability - CVE-2012-2549
A security feature bypass vulnerability exists in Windows due to the way the
IP-HTTPS Component handles certificates. An attacker who successfully
exploited this vulnerability could bypass certificate validation checks.
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