Security News > 2020 > June > SMBleed: A New Critical Vulnerability Affects Windows SMB Protocol

Cybersecurity researchers today uncovered a new critical vulnerability affecting the Server Message Block protocol that could allow attackers to leak kernel memory remotely, and when combined with a previously disclosed "Wormable" bug, the flaw can be exploited to achieve remote code execution attacks.

The newly discovered vulnerability impacts Windows 10 versions 1903 and 1909, for which Microsoft today released security patches as part of its monthly Patch Tuesday updates for June.

"Although Microsoft disclosed and provided updates for this vulnerability in March 2020, malicious cyber actors are targeting unpatched systems with the new PoC, according to recent open-source reports," CISA said.

"An attacker who successfully exploited the vulnerability could obtain information to further compromise the user's system. To exploit the vulnerability against a server, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv3 server," Microsoft said in its advisory.

Microsoft's security guidance addressing SMBleed and SMBGhost in Windows 10 version 1909 and 1903 and Server Core for the same versions can be found here and here.

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