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WN25-MS-000040 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.

DISA STIG library V1R4
All changes in this version
first version loaded CAT II

Maps to IA-3(1) via CCI-001967

Title

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.

Control

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)

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.

Related controls

CCI-001967

Fix

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