SV-253379r958478: Local users on domain-joined computers must not be enumerated. | Microsoft Windows 11 STIG SCAP Benchmark

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Assessment Title

Rule Text

Local users on domain-joined computers must not be enumerated.

Description

Discussion Text

The username is one part of logon credentials that could be used to gain access to a system. Preventing the enumeration of users limits this information to authorized personnel.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000381

References

DPMS Target Microsoft Windows 11 DISA DPMS Target Microsoft Windows 11 5471

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.windows11:def:253379
# Local users on domain-joined computers must not be enumerated.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Enumerate local users on domain-joined computers' is set to 'Disabled'
# 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\System').GetValueKind('EnumerateLocalUsers').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System' -Name 'EnumerateLocalUsers' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'EnumerateLocalUsers') -eq 0))
}

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_11 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows11:def:253379
$regPath = "HKLM:\SOFTWARE\Policies\Microsoft\Windows\System"
$regKey = "EnumerateLocalUsers"
$regValue = 0
if (Test-Path $regPath -ErrorAction SilentlyContinue) {
    $regData = Get-ItemProperty -Path $regPath -ErrorAction SilentlyContinue
    if ($regData -and $regData.PSObject.Properties.Name -contains $regKey) {
        if ($regData.$regKey -eq $regValue) {
            Write-Output "PASS"
            Exit 0
        }
    }
}
Write-Output "FAIL"
Exit 1

Remediation

This requirement is applicable to domain-joined systems, for standalone systems this is NA.

Configure the policy value for Computer Configuration >> Administrative Templates >> System >> Logon >> "Enumerate local users on domain-joined computers" to "Disabled".