Revision Note: V1.0 (December 9, 2013): Advisory published.
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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