Microsoft Security Advisory (2641690): Fraudulent Digital Certificates Could Allow Spoofing - Versio


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Revision Note: V2.0 (November 16, 2011): Revised to announce the rerelease of the KB2641690 update. See the Update FAQ in this advisory for more information. Also, added link to Microsoft Knowledge Base Article 2641690 under Known Issues in the Executive Summary.
Summary: Microsoft is aware that DigiCert Sdn. Bhd, a Malaysian subordinate certification authority (CA) under Entrust and GTE CyberTrust, has issued 22 certificates with weak 512 bit keys. These weak encryption keys, when broken, could allow an attacker to use the certificates fraudulently 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.


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