MSRC compact vulnerability detail

CVE-2022-26937 · Windows Network File System Remote Code Execution Vulnerability

No description was published by MSRC.

Severity
Critical
Impact
Remote Code Execution
CVSS
9.8 base · 8.5 temporal
Release
2022-05-10
Signals
Windows Network File System Remote Code Execution Exploited: No Publicly disclosed: No Exploitability: Exploitation More Likely
CWE
No CWE data published.
Patch Diff
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Resolved binary override
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Description
No description was published by MSRC.
FAQ / Articles
Mitigation
Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors might be helpful in your situation: This vulnerability is not exploitable in NFSV4.1. Prior to updating your version of Windows that protects against this vulnerability, you can mitigate an attack by disabling NFSV2 and NFSV3. This may adversely affect your ecosystem and should only be used as a temporary mitigation. The following PowerShell command will disable those versions: PS C:\Set-NfsServerConfiguration -EnableNFSV2 $false -EnableNFSV3 $false After this, you will need to restart NFS server or reboot the machine. To restart NFS server, start a cmd window with Run as Administrator, enter the following commands: nfsadmin server stop nfsadmin server start To confirm that NFSv2 and NFSv3 have been turned off, run the following command in a Powershell window: PS C:\Get-NfsServerConfiguration Here is the sample output, and notice the EnableNFSv2 and EnableNFSv3 are "False" now: State : Running LogActivity : CharacterTranslationFile : Not Configured DirectoryCacheSiz...
FAQ - PR:N RCE - Network File System service
How could an attacker exploit this vulnerability? This vulnerability could be exploited over the network by making an unauthenticated, specially crafted call to a Network File System (NFS) service to trigger a Remote Code Execution (RCE).