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             AUSCERT External Security Bulletin Redistribution

                          ESB-2008.0792 -- [Win]
         MS08-047 - Vulnerability in IPsec Policy Processing Could
                       Allow Information Disclosure
                              13 August 2008

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              IPsec
Publisher:            Microsoft
Operating System:     Windows Server 2008
                      Windows Vista
Impact:               Access Confidential Data
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-2246

Original Bulletin:  
  http://www.microsoft.com/technet/security/bulletin/ms08-047.mspx

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Microsoft Security Bulletin MS08-047 - Important

Vulnerability in IPsec Policy Processing Could Allow Information Disclosure
(953733)

   Published: August 12, 2008

   Version: 1.0

General Information

Executive Summary

   This update resolves a privately reported vulnerability in the way
   certain Windows Internet Protocol Security (IPsec) rules are applied.
   This vulnerability could cause systems to ignore IPsec policies and
   transmit network traffic in clear text. This, in turn, would disclose
   information intended to be encrypted on the network. An attacker
   viewing the traffic on the network would be able to view and possibly
   modify the contents of the traffic. Note that this vulnerability would
   not allow an attacker to execute code or to elevate their user rights
   directly. It could be used to collect useful information to try to
   further compromise the affected system or network.

   This update is rated Important for all supported versions of Windows
   Vista and Windows Server 2008. For more information, see the
   subsection, Affected Software, in this section.

   Recommendation. Microsoft recommends that customers apply the update
   at the earliest opportunity.

Affected Software

   Windows Vista and Windows Vista Service Pack 1

   Windows Vista x64 Edition and Windows Vista x64 Edition Service
   Pack 1

   Windows Server 2008 for 32-bit Systems

   Windows Server 2008 for x64-based Systems

   Windows Server 2008 for Itanium-based Systems

Vulnerability Information

IPsec Policy Information Disclosure Vulnerability - CVE-2008-2246

   An information disclosure vulnerability exists in the manner in which
   IPsec policies are imported to Windows Server 2008 domains from
   Windows Server 2003 domains. This vulnerability could cause systems to
   ignore IPsec policies and transmit network traffic in clear text.
   This, in turn, would potentially disclose information intended to be
   encrypted on the network. An attacker intercepting the traffic on the
   network would be able to view and possibly modify the contents of the
   traffic. Note that this vulnerability would not allow an attacker to
   execute code or to elevate their user rights directly. It could be
   used to collect useful information to try to further compromise the
   affected system.

Workarounds for IPsec Policy Information Disclosure Vulnerability -
CVE-2008-2246

   Do not select the "Default Response Rule" during IPsec policy creation
   or uncheck this rule from existing policies as this rule is no longer
   valid on Windows Vista and Windows Server 2008 and is only applicable
   on earlier versions of Windows. To emulate this rule in Windows Vista
   and Windows Server 2008, refer to Microsoft Knowledge Base Article
   942964.

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

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