Unauthenticated RPC clients must be restricted from connecting to the RPC server.

STIG ID: WN11-CC-000165 |  SRG: SRG-OS-000379-GPOS-00164 |  Severity: medium |  CCI:  | Vulnerability Id: V-253383

Vulnerability Discussion

Configuring RPC to restrict unauthenticated RPC clients from connecting to the RPC server will prevent anonymous connections.

Check

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Remote Procedure Call >> "Restrict Unauthenticated RPC clients" to "Enabled" and "Authenticated".

Fix

If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \SOFTWARE\Policies\Microsoft\Windows NT\Rpc\

Value Name: RestrictRemoteClients

Value Type: REG_DWORD
Value: 1