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Microsoft: Stolen SSL Certs No Good

September 11, 2011 by  
Filed under Computing

Comments Off on Microsoft: Stolen SSL Certs No Good

Microsoft has officially stated that a digital certificate stolen from a Dutch company could not be used to force-feed customers malware through its Windows Update service.

The company’s assertion came after a massive theft of more than 500 SSL (secure socket layer) certificates, including several that could be used to impersonate Microsoft’s update services, was revealed by Dutch authorities and several other affected developers.

“Attackers are not able to leverage a fraudulent Windows Update certificate to install malware via the Windows Update servers,” said Jonathan Ness, an engineer with the Microsoft Security Response Center (MSRC), in a Sunday blog post. “The Windows Update client will only install binary payloads signed by the actual Microsoft root certificate, which is issued
and secured by Microsoft.”

Seven of the 531 certificates now known to have been fraudulently obtained by hackers in July were for the domains update.microsoft.com and windowsupdate.com, while another six were for *.microsoft.com.

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