Check: WN19-MS-000040
Microsoft Windows Server 2019 STIG:
WN19-MS-000040
(in versions v3 r2 through v2 r5)
Title
Windows Server 2019 must restrict unauthenticated Remote Procedure Call (RPC) clients from connecting to the RPC server on domain-joined member servers and standalone or nondomain-joined systems. (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-205814r971545_rule
Vulnerability ID: V-205814
Group Title: SRG-OS-000379-GPOS-00164
Expert Comments
CCIs
| 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
| Number | Title |
|---|---|
| IA-3(1) |
Cryptographic Bidirectional Authentication |