#Security Vulnerability

**According to the CVSS metric, the attack vector is adjacent (AV:A). What does that mean for this vulnerability?** This vulnerability's attack is limited at the protocol level to a logically adjacent topology. This means it cannot simply be done across the internet, but instead needs something specific tied to the target. Good examples would include the same shared physical network (such as Bluetooth or IEEE 802.11), logical network (local IP subnet), or from within a secure or otherwise limited administrative domain (MPLS, secure VPN to an administrative network zone). This is common to many attacks that require man-in-the-middle type setups or that rely on initially gaining a foothold in another environment.

**How could an attacker exploit the vulnerability?** To exploit this vulnerability, an attacker would need to trick a user into executing a specially crafted script which executes an RPC call to an RPC host. This could result in remote code execution on the server side with the same permissions as the RPC service.

**What type of information could be disclosed by this vulnerability?** The presence of specific file names and users can be confirmed over the internal network.

**How could an attacker exploit this vulnerability?** There are multiple ways an attacker could exploit the vulnerability, such as by either convincing a user to open a specially crafted document, or by convincing a user to visit a webpage that contains specially crafted embedded OpenType fonts. The resulting Remote Code Execution would be within the context of the authenticated local user.

**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.

**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.

**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.

**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.

**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.

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...