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AUSCERT External Security Bulletin Redistribution
ESB-2010.0921
Vulnerability in SChannel Could Allow Denial of Service
13 October 2010
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AusCERT Security Bulletin Summary
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Product: Internet Information Services (ISS)
Publisher: Microsoft
Operating System: Windows Vista
Windows 7
Windows Server 2008
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2010-3229
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/MS10-085.mspx
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Microsoft Security Bulletin MS10-085 - Important
Vulnerability in SChannel Could Allow Denial of Service (2207566)
Version: 1.0
General Information
Executive Summary
This security update resolves a privately reported vulnerability in the Secure
Channel (SChannel) security package in Windows. The vulnerability could allow
denial of service if an affected Internet Information Services (IIS) server
hosting a Secure Sockets Layer (SSL)-enabled Web site received a specially
crafted packet message. By default, IIS is not configured to host SSL Web
sites.
This security update is rated Important for all supported editions of Windows
Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2. For more
information, see the subsection, Affected and Non-Affected Software, in this
section.
Affected Software
Windows Vista Service Pack 1 and Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition
Service Pack 2
Windows 7 for 32-bit Systems
Windows 7 for x64-based Systems
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit
Systems Service Pack 2
Windows Server 2008 for x64-based Systems and Windows Server 2008 for
x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for
Itanium-based Systems Service Pack 2
Windows Server 2008 R2 for x64-based Systems Windows Server 2008 R2 for
Itanium-based Systems
Vulnerability Information
TLSv1 Denial of Service Vulnerability - CVE-2010-3229
A denial of service vulnerability exists in the way that SChannel processes
client certificates in implementations of Internet Information Services (IIS)
7.0 on Windows Server 2008 and Windows Vista, and in IIS 7.5 on Windows Server
2008 R2 and Windows 7. A remote, anonymous attacker could send a specially
crafted network packet to the affected system that would cause the LSASS
service to stop responding and the system to restart. Systems are only
affected if SSL is enabled, which is not a default configuration.
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