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Warning — Unpatched Critical 'Wormable' Windows SMBv3 Flaw Disclosed

Shortly after releasing its monthly batch of security updates, Microsoft late yesterday separately issued an advisory warning billions of its Windows users of a new critical, unpatched, and wormable vulnerability affecting Server Message Block 3.0 (SMBv3) network communication protocol.

It appears Microsoft originally planned to fix the flaw as part of its March 2020 Patch Tuesday update only, but, for some reason, it pulled the plug at the last minute, which apparently did not stop a tech company from accidentally leaking the existence of the unpatched flaw.

The yet-to-be patched flaw (tracked as CVE-2020-0796), if exploited successfully, could allow an attacker to execute arbitrary code on the target SMB Server or SMB Client.

The belated acknowledgment from Microsoft led some researchers to call the bug "SMBGhost."

"To exploit the vulnerability against an SMB Server, an unauthenticated attacker could send a specially crafted packet to a targeted SMBv3 Server," Microsoft disclosed in an advisory. "To exploit the vulnerability against an SMB Client, an unauthenticated attacker would need to configure a malicious SMBv3 Server and convince a user to connect to it."

Server Message Block protocol provides the basis for file sharing, network browsing, prinAccording to a now-removed Cisco Talos post, the flaw opens vulnerable systems to a "wormable" attack, making it easy to propagate from one victim to the other.
Although it's unclear when Microsoft plans to patch the flaw, the company is urging users to disable SMBv3 compression and block TCP port 445 on firewalls and client computers as a workaround.

Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters" DisableCompression -Type DWORD -Value 1 -Force

Furthermore, Microsoft has cautioned that disabling SMBv3 compression will not prevent the exploitation of SMB clients.

It's worth pointing out that the flaw impacts only Windows 10 version 1903, Windows 10 version 1909, Windows Server version 1903, and Windows Server version 1909. But it's possible more versions are affected as SMB 3.0 was introduced with Windows 8 and Windows Server 2012.

Despite the severity of the SMB bug, there's no evidence that it's being exploited in the wild. But it's also necessary to draw attention to the fact that this is far from the only time SMB has been exploited as an attack vector for intrusion attempts.

In the past few years alone, some of the major ransomware infections, including WannaCry and NotPetya, have been the consequence of SMB-based exploits.

For now, until Microsoft releases a security update designed to patch the CVE-2020-0796 RCE flaw, it's recommended that the system administrators implement the workarounds to block attacks attempting to exploit the vulnerability.ting services, and interprocess communication over a network.

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