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             AUSCERT External Security Bulletin Redistribution

        Vulnerability in Microsoft Windows Could Allow Remote Code
                            Execution (2385678)
                             15 December 2010


        AusCERT Security Bulletin Summary

Product:           Windows BranchCache
Publisher:         Microsoft
Operating System:  Windows 7
                   Windows Server 2008
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2010-3966  

Original Bulletin: 

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Microsoft Security Bulletin MS10-095 - Important

Vulnerability in Microsoft Windows Could Allow Remote Code Execution (2385678)

Version: 1.0

General Information

Executive Summary

  This security update resolves a privately reported vulnerability in 
  Microsoft Windows. The vulnerability could allow remote code execution if
  a user opens a file type such as .eml and .rss (Windows Live Mail) or
  .wpost (Microsoft Live Writer) located in the same network folder as a
  specially crafted library file. For an attack to be successful, a user must
  visit an untrusted remote file system location or WebDAV share and open a
  document from this location that is then loaded by a vulnerable application.

  This security update is rated Important for all supported editions of
  Windows 7 and Windows Server 2008 R2. For more information, see the
  subsection, Affected and Non-Affected Software, in this section.

  The security update addresses the vulnerability by correcting the manner in
  which the Windows BranchCache loads external libraries. For more information
  about the vulnerability, see the Frequently Asked Questions (FAQ) subsection
  for the specific vulnerability entry under the next section, Vulnerability

Affected Software

  Windows 7 for 32-bit Systems
  Windows 7 for x64-based Systems
  Windows Server 2008 R2 for x64-based Systems*
  Windows Server 2008 R2 for Itanium-based Systems

  *Server Core installation affected.

Vulnerability Information

BranchCache Insecure Library Loading Vulnerability - CVE-2010-3966

  A remote code execution vulnerability exists in the way that Microsoft
  Windows opens specific files on platforms that do not support the
  BranchCache functionality. An attacker who successfully exploited this
  vulnerability could take complete control of an affected system. An attacker
  could then install programs; view, change, or delete data; or create new
  accounts with full user rights. Users whose accounts are configured to have
  fewer user rights on the system could be less impacted than users who operate
  with administrative user rights.

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