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by John W. Simek, Vice President of Sensei Enterprises, Inc.

Microsoft Releases Emergency Patch for SMBv3 Vulnerability

March 16, 2020

Last week brought a new discovery of a severe vulnerability for Server Message Block (SMB). A manual workaround was published, but now Microsoft has released an official patch. The Hacker News posted some of the technical details. For those that don't know, SMB is used over a network to enable printing services, file sharing, interprocess network communications, and browsing for network services. As stated in the post, "The vulnerability, tracked as CVE-2020-0796, in question is a remote code execution flaw that impacts Windows 10 version 1903 and 1909, and Windows Server version 1903 and 1909."

Your firewall should be configured to block TCP port 445, which is used for the SMB protocol. Besides that, install the patch now.

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