Microsoft Windows Server 2025

Windows Server 2025 must restrict unauthenticated Remote Procedure Call (RPC) clients from connecting to the RPC server on domain-joined member servers and stand-alone or nondomain-joined systems

STIG ID: WN25-MS-000040 | SRG: SRG-OS-000379-GPOS-00164 | Severity: Medium | CCI: CCI-001967 | Vulnerability ID: V-278180

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-82710r1182285_chk

This applies to member servers and stand-alone or nondomain-joined systems, it is not applicable for domain controllers.

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

Registry HiveHKEY_LOCAL_MACHINE
Registry Path\SOFTWARE\Policies\Microsoft\Windows NT\Rpc\

Value NameRestrictRemoteClients

TypeREG_DWORD
Value0x00000001 (1)

Fix

F-82615r1181245_fix

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