SV-226283r794585: The maximum age for machine account passwords must be set to requirements. | Microsoft Windows Server 2012/2012 R2 Domain Controller STIG SCAP Benchmark

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Assessment Title

Rule Text

The maximum age for machine account passwords must be set to requirements.

Description

Discussion Text

Computer account passwords are changed automatically on a regular basis. This setting controls the maximum password age that a machine account may have. This setting must be set to no more than 30 days, ensuring the machine changes its password monthly.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000366CCE-23596-0SV-52887V-3373

References

DPMS Target Microsoft Windows Server 2012-2012 R2 DC DISA DPMS Target Microsoft Windows Server 2012-2012 R2 DC 4217

Checks

OVAL

oval:mil.disa.fso.windows:var:455100 ← xccdf_mil.disa.stig_value_maximum_machine_account_password_age_var

DISA STIG (Manual Reference)

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: \System\CurrentControlSet\Services\Netlogon\Parameters\

Value Name: MaximumPasswordAge

Value Type: REG_DWORD
Value: 30 (or less, but not 0)

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.fso.windows:def:4551
# The maximum age for machine account passwords must be set to requirements.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Domain member: Maximum machine account password age' is set to '30' days or less
# 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\Services\Netlogon\Parameters').GetValueKind('MaximumPasswordAge').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Netlogon\Parameters' -Name 'MaximumPasswordAge' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'MaximumPasswordAge') -le 30))
}
# Verifies 'Domain member: Maximum machine account password age' is not set to '0'
# registry_object (registry_test)
function test_2 {
  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\Services\Netlogon\Parameters').GetValueKind('MaximumPasswordAge').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Netlogon\Parameters' -Name 'MaximumPasswordAge' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'MaximumPasswordAge') -gt 0))
}

if ((test_1 -and test_2)) {
  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_2012_and_2012_r2_dc target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:4551

if (!(Test-Path -Path "HKLM:\System\CurrentControlSet\Services\Netlogon\Parameters\MaximumPasswordAge")) {exit 1} 
if ((Get-ItemProperty -Path "HKLM:\System\CurrentControlSet\Services\Netlogon\Parameters\MaximumPasswordAge").MaximumPasswordAge -gt 30) {exit 1} 
if ((Get-ItemProperty -Path "HKLM:\System\CurrentControlSet\Services\Netlogon\Parameters\MaximumPasswordAge").MaximumPasswordAge -eq 0) {exit 1} 
exit 0

Remediation

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Domain member: Maximum machine account password age" to "30" or less (excluding "0" which is unacceptable).