Microsoft re-released Microsoft Security Advisory (2607712) regarding fraudulent DigiNotar Root CA. "Microsoft is aware of active attacks using at least one fraudulent digital certificate issued by DigiNotar, a certification authority present in the Trusted Root Certification Authorities Store."[1]

The update is available for all supported version of Windows here and via automatic updates.

[1] http://technet.microsoft.com/en-us/security/advisory/2607712
[2] http://support.microsoft.com/kb/2616676
[3] http://blogs.technet.com/b/msrc/archive/2011/09/19/cumulative-non-security-update-protects-from-fraudulent-certificates.aspx

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Guy Bruneau IPSS Inc. gbruneau at isc dot sans dot edu