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AUSCERT External Security Bulletin Redistribution
Microsoft Security Advisory (2607712) Fraudulent Digital
Certificates Could Allow Spoofing
30 August 2011
AusCERT Security Bulletin Summary
Product: Microsoft Windows
Operating System: Windows XP
Windows Server 2003
Windows Server 2008
Impact/Access: Provide Misleading Information -- Remote with User Interaction
Revision History: August 30 2011: Revised to correct erroneous advisory number
August 30 2011: Initial Release
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Microsoft Security Advisory (2607712)
Fraudulent Digital Certificates Could Allow Spoofing
Published: August 29, 2011
Microsoft is aware of at least one fraudulent digital certificate issued by
DigiNotar, a certification authority present in the Trusted Root Certification
Authorities Store, on all supported releases of Microsoft Windows. Although
this is not a vulnerability in a Microsoft product, Microsoft is taking action
to protect customers.
Microsoft has been able to confirm that one digital certificate affects all
subdomains of google.com and may be used to spoof content, perform phishing
attacks, or perform man-in-the-middle attacks against all Web browser users
including users of Internet Explorer. Microsoft is continuing to investigate
how many more certificates have been fraudulently issued. As a precautionary
measure, Microsoft has removed the DigiNotar root certificate from the
Microsoft Certificate Trust List.
All supported editions of Windows Vista, Windows 7, Windows Server 2008, and
Windows Server 2008 R2 use the Microsoft Certificate Trust List to validate
the trust of a certification authority. Users of these operating systems will
be presented with an invalid certificate error when they browse to a Web site
or try to install programs signed by the DigiNotar root certificate. In those
cases users should follow the instructions in the message. Microsoft will
release a future update to address this issue for all supported editions of
Windows XP and Windows Server 2003.
Microsoft is continuing to investigate this issue and may release future
updates to help protect customers.
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 affected. This advisory applies to supported
editions of Windows Server 2008 or Windows Server 2008 R2 as indicated,
whether or not installed using the Server Core installation option. For
more information on this installation option, see the TechNet articles,
Managing a Server Core Installation and Servicing a Server Core Installation.
Note that the Server Core installation option does not apply to certain
editions of Windows Server 2008 and Windows Server 2008 R2; see Compare Server
Core Installation Options.
V1.0 (August 29, 2011): Advisory published.
V2.0 (August 29, 2011): Revised to correct erroneous advisory number.
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