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

STIG ID: WN22-MS-000040 | SRG: SRG-OS-000379-GPOS-00164 | Severity: Medium | CCI: CCI-001967 | Vulnerability ID: V-254431

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

C-57916r849107_chk

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

F-57867r849108_fix

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