Microsoft Security Advisory (2916652): Improperly Issued Digital Certificates Could Allow Spoofing – Version: 2.0

Revision Note: V2.0 (December 12, 2013): Advisory revised to announce the availability of the 2917500 update for customers running Windows XP or Windows Server 2003, or for customers who choose not to install the automatic updater of revoked certificates. The 2917500 update is available via the Microsoft Update service and from the download center. For more information, see the Suggested Actions section of this advisory.
Summary: Microsoft is aware of an improperly issued subordinate CA certificate that could be used in attempts to spoof content, perform phishing attacks, or perform man-in-the-middle attacks. The subordinate CA certificate was improperly issued by the Directorate General of the Treasury (DG Trésor), subordinate to the Government of France CA (ANSSI), which is a CA present in the Trusted Root Certification Authorities Store. This issue affects all supported releases of Microsoft Windows. Microsoft is not currently aware of attacks related to this issue.

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