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AUSCERT External Security Bulletin Redistribution
Vulnerability in IP-HTTPS Component Could Allow Security
Feature Bypass (2765809)
11 December 2012
AusCERT Security Bulletin Summary
Operating System: Windows Server 2008 R2
Windows Server 2012
Impact/Access: Unauthorised Access -- Existing Account
CVE Names: CVE-2012-2549
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Microsoft Security Bulletin MS12-083 - Important
Vulnerability in IP-HTTPS Component Could Allow Security Feature Bypass
Published Date: December 11, 2012
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.
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
Windows Server 2012 (Server Core installation)
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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