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Zero-day Windows file-sharing flaw can crash systems, maybe worse

Lucian Constantin | Feb. 6, 2017
The vulnerability was publicly disclosed before being patched and researchers are still debating its impact

Microsoft did not immediately respond to a request for comment.

Both CERT/CC and Eiram advise network administrators to block outbound SMB connections -- TCP ports 139 and 445 along with UDP ports 137 and 138 -- from local networks to the Internet. This won't completely eliminate the threat, but will isolate it to local networks.

 

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