Windows Server 2019 must restrict unauthenticated Remote Procedure Call (RPC) clients from connecting to the RPC server on domain-joined member servers and standalone systems.

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Windows Server 2019 must restrict unauthenticated Remote Procedure Call (RPC) clients from connecting to the RPC server on domain-joined member servers and standalone systems.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-205814	WN19-MS-000040	SV-205814r569188_rule		Medium

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.

STIG	Date
Microsoft Windows Server 2019 Security Technical Implementation Guide	2021-08-18

Details

Check Text ( C-6079r355804_chk )
This applies to member servers and standalone 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_MACHINE Registry Path: \SOFTWARE\Policies\Microsoft\Windows NT\Rpc\ Value Name: RestrictRemoteClients Type: REG_DWORD Value: 0x00000001 (1)

Fix Text (F-6079r355805_fix)
Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Remote Procedure Call >> "Restrict Unauthenticated RPC clients" to "Enabled" with "Authenticated" selected.