SV-220979r958726: The Modify firmware environment values user right must only be assigned to the Administrators group. | Microsoft Windows 10 STIG SCAP Benchmark

Loading benchmark…

Assessment Title

Rule Text

The Modify firmware environment values user right must only be assigned to the Administrators group.

Description

Discussion Text

Inappropriate granting of user rights can provide system, administrative, and other high level capabilities. Accounts with the "Modify firmware environment values" user right can change hardware configuration environment variables. This could result in hardware failures or a DoS.

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

IA Controls

NIST SP 800-53

Not mappedCCI-002235V-63931SV-78421

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:220979
# The Modify firmware environment values user right must only be assigned to the Administrators group.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Modify firmware environment values - Administrators
# accesstoken_object (accesstoken_test)
function test_1 {
  return (($__tmp = "$env:TEMP\scc_userrights_$([guid]::NewGuid().Guid).cfg"; secedit /export /cfg $__tmp /areas USER_RIGHTS /quiet | Out-Null; $__m = Select-String -Path $__tmp -Pattern '^SeSystemEnvironmentPrivilege\s*=\s*(.+)$'; Remove-Item $__tmp -ErrorAction SilentlyContinue; if ($__m -and $__m.Matches[0].Groups[1].Value.Trim().Length -gt 0) { '1' } else { '0' }) -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_10 target this check assesses.

# OVAL Definition: oval:mil.disa.stig.windows10:def:220979
powershell
Get-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters" -Name "AllowInsecureGuestAccount" -ErrorAction SilentlyContinue; if (-not (Get-LocalGroupMember -Group "Administrators" -ErrorAction SilentlyContinue | Where-Object { $_.Name -eq "SeSystemEnvironmentPrivilege" })) { Write-Output "FAIL"; exit 1 } else { Write-Output "PASS"; exit 0 }

Remediation

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Modify firmware environment values" to only include the following groups or accounts:

Administrators