#Security Vulnerability

**I am running a supported version of Windows Server. Is my system vulnerable to this issue?** Systems configured to activate both of the following features in Windows Server: CredSSP (Credential Security Service Provider) and RCG (Remote Credential Guard) might be vulnerable to this exploit.

**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 take additional actions prior to exploitation to prepare the target environment.

**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 prepare the target environment to improve exploit reliability.

**Are there any special conditions necessary for this vulnerability to be exploitable?** Yes. This vulnerability is only exploitable if the MaxReceiveBuffer LDAP policy is set to a value higher than the default value. Systems with the default value of this policy would not be vulnerable. For more information, please see LDAP policies.

**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 prepare the target environment to improve exploit reliability.

**Are there any special conditions necessary for this vulnerability to be exploitable?** Yes. This vulnerability is only exploitable if the MaxReceiveBuffer LDAP policy is set to a value higher than the default value. Systems with the default value of this policy would not be vulnerable. For more information, please see LDAP policies.

**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 gather information specific to the environment of the targeted component.

**According to the CVSS metric, Privileges Required is High (PR:H). What would lead to a successful attack?** In order for the successful attack to be initiated, the attacker would need to have read/write access to the cluster and the ability to host a hostile code without any isolation.

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...

**According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution?** The word **Remote** in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally. For example, when the score indicates that the **Attack Vector** is **Local** and **User Interaction** is **Required**, this could describe an exploit in which an attacker, through social engineering, convinces a victim to download and open a specially crafted file from a website which leads to a local attack on their computer.