Microsoft Windows Server 2022
Windows Server 2022 must restrict unauthenticated Remote Procedure Call (RPC) clients from connecting to the RPC server on domain-joined member servers and standalone or nondomain-joined systems
Description
Unauthenticated RPC clients may allow anonymous access to sensitive information. Configuring RPC to restrict unauthenticated RPC clients from connecting to the RPC server will prevent anonymous connections.
Check
This applies to member servers and standalone or nondomain-joined systems, it is NA for domain controllers.If the following registry value does not exist or is not configured as specified, this is a finding:Registry Hive: HKEY_LOCAL_MACHINERegistry Path: \SOFTWARE\Policies\Microsoft\Windows NT\Rpc\Value Name: RestrictRemoteClientsType: REG_DWORDValue: 0x00000001 (1)
Fix
Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Remote Procedure Call >> Restrict Unauthenticated RPC clients to "Enabled" with "Authenticated" selected.