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 (CAT II)  |  CCI: CCI-001967 |  Vulnerability Id: V-278180

Vulnerability Discussion

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 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

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Remote Procedure Call >> Restrict Unauthenticated RPC clients to "Enabled" with "Authenticated" selected.
This website is not created by, run, approved, or endorsed by the U.S. Department of Defense. Use at your own risk. This website is created by open-source software.