SV-220937r1051034: The system must be configured to prevent the storage of the LAN Manager hash of passwords. | Microsoft Windows 10 STIG SCAP Benchmark

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Assessment Title

Rule Text

The system must be configured to prevent the storage of the LAN Manager hash of passwords.

Description

Discussion Text

The LAN Manager hash uses a weak encryption algorithm and there are several tools available that use this hash to retrieve account passwords. This setting controls whether or not a LAN Manager hash of the password is stored in the SAM the next time the password is changed.

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

IA Controls

NIST SP 800-53

Not mappedCCI-004062Not mappedCCI-000196SV-78287V-63797

References

DPMS Target Microsoft Windows 10 DISA DPMS Target Microsoft Windows 10 4072

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.windows10:def:220937
# The system must be configured to prevent the storage of the LAN Manager hash of passwords.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Network security: Do not store LAN Manager hash value on next password change' 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('NoLMHash').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Lsa' -Name 'NoLMHash' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'NoLMHash') -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_10 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows10:def:220937
$registryPath = "HKLM:\System\CurrentControlSet\Control\Lsa"
$registryKey = "NoLMHash"
$registryValue = 1

if (Test-Path $registryPath -PathType Container) {
    $regValue = Get-ItemProperty -Path $registryPath -Name $registryKey -ErrorAction SilentlyContinue
    if ($regValue -and $regValue.$registryKey -eq $registryValue) {
        Write-Output "PASS"
        exit 0
    }
}
Write-Output "FAIL"
exit 1

Remediation

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network security: Do not store LAN Manager hash value on next password change" to "Enabled".