Due to an apparent error in the Microsoft vulnerability disclosure process, news of an unpatched, critical Microsoft Server Message Block (SMB) vulnerability leaked to the public this past Patch Tuesday. In response to this occurrence, Microsoft today issued an out-of-band security update fixing the flaw.
If exploited, the bug could result in a wormable remote code execution attack on a targeted SMB server or client.
Designated CVE-2020-0796, the flaw pertains to how the Microsoft SMB 3.1.1 (or SMBv3) protocol handles certain requests. Microsoft last Tuesday, in a security advisory that was not officially part of the company's Patch Tuesday announcements, acknowledged the existence of the bug.
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