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             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.0847
         Microsoft Security Advisory (2661254) Update For Minimum
                          Certificate Key Length
                             7 September 2012

===========================================================================

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

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows XP
                   Windows Server 2003
                   Windows Server 2008 R2
                   Windows Vista
                   Windows 7
Impact/Access:     Reduced Security -- Unknown/Unspecified
Resolution:        Mitigation

Original Bulletin: 
   http://technet.microsoft.com/en-us/security/advisory/2661254

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Microsoft Security Advisory (2661254)
Update For Minimum Certificate Key Length

Published: Tuesday, August 14, 2012 | Updated: Tuesday, August 14, 2012

Version: 1.1
General Information
Executive Summary

Microsoft is announcing the availability of an update to Windows that restricts 
the use of certificates with RSA keys less than 1024 bits in length. The 
private keys used in these certificates can be derived and could allow an 
attacker to duplicate the certificates and use them fraudulently to spoof 
content, perform phishing attacks, or perform man-in-the-middle attacks.

The update is available on the Download Center as well as the Microsoft Update 
Catalog for all supported releases of Microsoft Windows. In addition, Microsoft 
is planning to release this update through Microsoft Update in October, 2012 
after customers have a chance to assess the impact of this update and take 
necessary actions to use certificates with RSA keys greater than or equal to 
1024 bits in length in their enterprise.

Recommendation. Microsoft recommends that customers download the update and 
assess the impact of blocking certificates with RSA keys less than 1024 bits in 
length before applying the update to their enterprise. Please see the Suggested 
Actions section of this advisory for more information.

Known Issues. Microsoft Knowledge Base Article 2661254 documents the currently 
known issues that customers may experience when installing this update. The 
article also documents recommended solutions for these issues.
http://support.microsoft.com/kb/2661254

Advisory Details
Issue References

For more information about this issue, see the following references:
References	                        Identification
Microsoft Knowledge Base Article	2661254 

Affected Software and Devices

This advisory discusses the following software.

Operating System
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 Service Pack 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2*
Windows Server 2008 for x64-based Systems Service Pack 2*
Windows Server 2008 for Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service 
  Pack 1
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for 
  x64-based Systems Service Pack 1*
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2 
  for Itanium-based Systems Service Pack 1
Server Core installation option Windows Server 2008 for 32-bit Systems 
  Service Pack 2 (Server Core installation)
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core 
  installation)
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for 
  x64-based Systems Service Pack 1 (Server Core installation)

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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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