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AUSCERT External Security Bulletin Redistribution
ESB-2009.1610
Critical Vulnerabilities in Internet Authentication Service
Could Allow Remote Code Execution
9 December 2009
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AusCERT Security Bulletin Summary
---------------------------------
Product: Internet Authentication Service
Publisher: Microsoft
Operating System: Windows XP
Windows 2000
Windows Vista
Windows Server 2008
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Increased Privileges -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2009-3677 CVE-2009-2505
Original Bulletin:
http://www.microsoft.com/technet/security/Bulletin/MS09-071.mspx
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Microsoft Security Bulletin MS09-071
Critical Vulnerabilities in Internet Authentication Service Could Allow Remote
Code Execution (974318)
Published: December 08, 2009
Version: 1.0
General Information
Executive Summary
This security update resolves two privately reported vulnerabilities in
Microsoft Windows. These vulnerabilities could allow remote code execution
if messages received by the Internet Authentication Service server are
copied incorrectly into memory when handling PEAP authentication attempts.
An attacker who successfully exploited either of these vulnerabilities could
take complete control of an affected system. Servers using Internet
Authentication Service are only affected when using PEAP with MS-CHAP v2
authentication.
This security update is rated Critical for Windows Server 2008 for 32-bit
Systems Service Pack 2 and Windows Server 2008 for x64-based Systems Service
Pack 2. For all other affected and supported releases of Windows, see the
subsection, Affected and Non-Affected Software, in this section.
The security update addresses the vulnerabilities by correcting the way
Internet Authentication Service validates authentication requests by PEAP
clients. For more information about the vulnerabilities, see the Frequently
Asked Questions (FAQ) subsection for the specific vulnerability entry under
the next section, Vulnerability Information.
Affected and Non-Affected Software
Microsoft Windows 2000 Service Pack 4
Windows XP Service Pack 2 and Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
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 and Windows Vista Service Pack 1
Windows Vista Service Pack 2
Windows Vista x64 Edition and Windows Vista x64 Edition Service Pack 1
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems
Windows Server 2008 for 32-bit Systems Service Pack 2*
Windows Server 2008 for x64-based Systems*
Windows Server 2008 for x64-based Systems Service Pack 2*
Windows Server 2008 for Itanium-based Systems
Windows Server 2008 for Itanium-based Systems Service Pack 2
Vulnerability Information
Internet Authentication Service Memory Corruption Vulnerability -
CVE-2009-2505
A remote code execution vulnerability exists in implementations of
Protected Extensible Authentication Protocol (PEAP) on the Internet
Authentication Service. The vulnerability is due to incorrect copying into
memory of messages received by the server when handling PEAP authentication
attempts. An attacker who successfully exploited this vulnerability could
take complete control of an affected system.
MS-CHAP Authentication Bypass Vulnerability - CVE-2009-3677
An elevation of privilege vulnerability exists in the Internet Authentication
Service. An attacker could send a specially crafted Microsoft Challenge
Handshake Authentication Protocol version 2 (MS-CHAP v2) authentication
request that could obtain access to network resources under the privileges of
a specific, authorized user.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
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