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Check: WN16-MS-000040

Microsoft Windows Server 2016 STIG: WN16-MS-000040 (in versions v2 r9 through v2 r5)

Title

Unauthenticated Remote Procedure Call (RPC) clients must be restricted from connecting to the RPC server. (Cat II impact)

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 Content

This applies to member servers and standalone or nondomain-joined 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

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

Additional Identifiers

Rule ID: SV-225010r971545_rule

Vulnerability ID: V-225010

Group Title: SRG-OS-000379-GPOS-00164

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-001967	Authenticate organization-defined devices and/or types of devices before establishing a local, remote, and/or network connection using bidirectional authentication that is cryptographically based.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
IA-3(1)	Cryptographic Bidirectional Authentication