SV-254431r971545: Windows Server 2022 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. | Microsoft Windows Server 2022 STIG SCAP Benchmark

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Assessment Title

Rule Text

Windows Server 2022 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.

Description

Discussion Text

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.

How this relates to the STIG checklist: STIG vs SCAP benchmark.

IA Controls

NIST SP 800-53

Not mappedCCI-001967

References

DPMS Target Microsoft Windows Server 2022 DISA DPMS Target Microsoft Windows Server 2022 5485

SCC Automation Reference

The reconstructed evaluation script behind this rule's OVAL check(s) — every module a compound check combines, with this rule's own concrete values and DISA's SCC tool's real per-module mechanism curated from static teardown of SCC releases.

# Windows PowerShell
# Reconstructed from oval:mil.disa.stig.windows2022:def:254431
# Windows Server 2022 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.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Restrict Unauthenticated RPC clients' is set to 'Enabled' and 'Authenticated'
# registry_object (registry_test)
function test_1 {
  return (((@{String='reg_sz';ExpandString='reg_expand_sz';Binary='reg_binary';DWord='reg_dword';MultiString='reg_multi_sz';QWord='reg_qword';None='reg_none'}[(Get-Item -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Rpc').GetValueKind('RestrictRemoteClients').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Rpc' -Name 'RestrictRemoteClients' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'RestrictRemoteClients') -eq 1))
}

if (test_1) {
  Write-Output "PASS"
} else {
  Write-Output "FAIL"
}

Assessment Script Powered by AISyntax-verified

A standalone PowerShell script to assess this control automatically. Review before running it in your environment.

Syntax-checked as valid PowerShell. Not executed here — running it for real needs the actual ms_windows_server_2022 target this check assesses.

# oval:mil.disa.stig.windows2022:def:254431
if (Test-Path -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Rpc" -ErrorAction SilentlyContinue) { $reg = Get-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\Rpc" -Name "RestrictRemoteClients" -ErrorAction SilentlyContinue; if ($reg -ne $null -and $reg.RestrictRemoteClients -eq 1) { Write-Output "PASS"; exit 0 } } Write-Output "FAIL"; exit 1

Remediation

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