#Windows Network File System

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 NFSV2.0 or NFSV3.0. Prior to updating your version of Windows that protects against this vulnerability, you can mitigate an attack by disabling NFSV4.1. This could adversely affect your ecosystem and should only be used as a temporary mitigation. **Warning** You should NOT apply this mitigation unless you have installed the May 2022 Windows security updates. Those updates address CVE-2022-26937 which is a Critical vulnerability in NFSV2.0 and NFSV3.0. The following PowerShell command will disable those versions: PS C:\Set-NfsServerConfiguration -EnableNFSV4 $false After running the command, you will need to restart NFS server or reboot the machine. To restart NFS server, start a **cmd** window with...

**What type of information could be disclosed by this vulnerability?** The type of information that could be disclosed if an attacker successfully exploited this vulnerability is the contents of Kernel memory. An attacker could read the contents of Kernel memory from a user mode process.

**I am running a supported version of Windows Server. Is my system vulnerable to this issue?** This vulnerability is only exploitable for systems that have the NFS role enabled. See NFS Overview for more information on this feature. More information on installing or uninstalling Roles or Role Services is available here.

**According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?** Successful exploitation of this vulnerability requires an attacker to win a race condition.

**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).

**What type of information could be disclosed by this vulnerability?** The type of information that could be disclosed if an attacker successfully exploited this vulnerability is uninitialized memory.

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 NFSV2.0 or NFSV3.0. Prior to updating your version of Windows that protects against this vulnerability, you can mitigate an attack by disabling NFSV4.1. This could adversely affect your ecosystem and should only be used as a temporary mitigation. **Warning** You should NOT apply this mitigation unless you have installed the May 2022 Windows security updates. Those updates address CVE-2022-26937 which is a Critical vulnerability in NFSV2.0 and NFSV3.0. The following PowerShell command will disable those versions: PS C:\Set-NfsServerConfiguration -EnableNFSV4 $false After running the command, you will need to restart NFS server or reboot the machine. To restart NFS server, start a **cmd** window with...

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 Powershe...

**I am running a supported version of Windows Server. Is my system vulnerable to this issue?** This vulnerability is only exploitable for systems that have the NFS role enabled. See NFS Overview for more information on this feature. More information on installing or uninstalling Roles or Role Services is available here.

**I am running a supported version of Windows Server. Is my system vulnerable to this issue?** This vulnerability is only exploitable for systems that have the NFS role enabled. See NFS Overview for more information on this feature. More information on installing or uninstalling Roles or Role Services is available here.