QID 91900

Date Published: 2022-05-11

QID 91900: Microsoft Windows Network File System (NFS) Remote Code Execution (RCE) Vulnerability for May 2022

Microsoft Windows Network File System is vulnerable to Remote Code Execution Vulnerability.

This vulnerability is not exploitable in NFSV4.1.

The KB Articles associated with the update are:
5013941
5013942
5013944
5013952
5013999
5014001
5014006
5014010
5014011
5014012
5014017
5014018

QID Detection Logic (Authenticated):

This QID checks for the file version of rpcxdr.sys.

An attacker could send a specially crafted NFS protocol network message to a vulnerable Windows machine, which could enable remote code execution.

  • CVSS V3 rated as Critical - 9.8 severity.
  • CVSS V2 rated as Critical - 10 severity.
    • Solution
    Please refer to the CVE-2022-26937 for more information pertaining to these vulnerabilities.

    Workaround:
    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

    Vendor References

    CVEs related to QID 91900

    CVE-2022-26937 |
    Software Advisories
    Advisory ID Software Component Link
    CVE-2022-26937 URL Logo msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2022-26937
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