Unauthenticated RPC clients must be restricted from connecting to the RPC server.

From Windows Server 2008 R2 Member Server Security Technical Implementation Guide

Part of RPC - Unauthenticated RPC Clients

Associated with: CCI-001967

SV-32396r2_rule Unauthenticated RPC clients must be restricted from connecting to the RPC server.

Vulnerability discussion

Configuring RPC to restrict unauthenticated RPC clients from connecting to the RPC server will prevent anonymous connections.

Check content

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: 1

Fix text

Configure the policy value for Computer Configuration -> Administrative Templates -> System -> Remote Procedure Call -> "Restrictions for Unauthenticated RPC clients" to "Enabled" and "Authenticated".

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