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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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===========================================================================
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The University of Queensland
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