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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. A fraudulent certificate could 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. While this is not a vulnerability in a Microsoft product, this issue affects all supported releases of Microsoft Windows.
So, over the weekend, we became aware that a Dutch certificate authority had been hacked, and a whole truckload of fake certificates issued for people like google, cia.gov, and mossad, to mention just a few of the more embarrasing ones. In the fullness of time, it's become clear that the initial result of this is that for at least a day, Iranian Internet users were subject to mass Man In The Middle attacks.