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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
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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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On call after hours for member emergencies only.
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