SV-254467r1137695: Windows Server 2022 must not allow anonymous enumeration of shares. | Microsoft Windows Server 2022 STIG SCAP Benchmark

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Assessment Title

Rule Text

Windows Server 2022 must not allow anonymous enumeration of shares.

Description

Discussion Text

Allowing anonymous logon users (null session connections) to list all account names and enumerate all shared resources can provide a map of potential points to attack the system.

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

IA Controls

NIST SP 800-53

Not mappedCCI-001090

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:254467
# Windows Server 2022 must not allow anonymous enumeration of shares.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Network access: Do not allow anonymous enumeration of SAM accounts and shares' is set to 'Enabled'
# 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\SYSTEM\CurrentControlSet\Control\Lsa').GetValueKind('restrictanonymous').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa' -Name 'restrictanonymous' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'restrictanonymous') -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 Definition: oval:mil.disa.stig.windows2022:def:254467
$regPath = "HKLM:\SYSTEM\CurrentControlSet\Control\Lsa"
$regKey = "restrictanonymous"
if (-Not (Test-Path $regPath)) { $regPath = "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters" }
if (Test-Path "$regPath\$regKey" -and (Get-ItemProperty -Path "$regPath\$regKey").restrictanonymous -eq 1) { Write-Output "PASS"; exit 0 } else { Write-Output "FAIL"; exit 1 }

Remediation

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> Network access: Do not allow anonymous enumeration of SAM accounts and shares to "Enabled".