What is KB2524375?

Answer 1

KB2524375 is a recently (as of April 2011) released downloadable (from the Microsoft website) update. It is related to a Microsoft Security Advisory dealing with nine fraudulent digital certificates issued by Comodo, a certification authority present in the Trusted Root Certification Authorities Store on all supported versions of Microsoft Windows. Comodo advised Microsoft on March 16, 2011 that nine certificates had been signed on behalf of a third party without sufficiently validating its identity. These certificates may 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. It is suspected, but not yet confirmed, that a nation-state was involved in the compromise of the certificates. See the attached link for more information.