SV-226212r852114: Nonadministrators must be prevented from applying vendor-signed updates. | Microsoft Windows Server 2012/2012 R2 Domain Controller STIG SCAP Benchmark

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Assessment Title

Rule Text

Nonadministrators must be prevented from applying vendor-signed updates.

Description

Discussion Text

Uncontrolled system updates can introduce issues to a system. This setting will prevent users from applying vendor-signed updates (though they may be from a trusted source).

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

IA Controls

NIST SP 800-53

Not mappedCCI-001812CCE-23601-8SV-53065V-15686

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:452800 ← xccdf_mil.disa.stig_value_prohibit_non_administrators_install_signed_updates_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: \Software\Policies\Microsoft\Windows\Installer\

Value Name: DisableLUAPatching

Type: REG_DWORD
Value: 1

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:4528
# Nonadministrators must be prevented from applying vendor-signed updates.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies 'Prohibit non-administrators from applying vendor signed updates' 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\Software\Policies\Microsoft\Windows\Installer').GetValueKind('DisableLUAPatching').ToString()]) -eq 'reg_dword') -and (((Get-ItemProperty -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Installer' -Name 'DisableLUAPatching' -ErrorAction SilentlyContinue) | Select-Object -ExpandProperty 'DisableLUAPatching') -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_2012_and_2012_r2_dc target this check assesses.

# OVAL Definition: oval:mil.disa.fso.windows:def:4528
$compliant = Test-Path -Path "HKLM:\Software\Policies\Microsoft\Windows\Installer" -ErrorAction SilentlyContinue; if ($compliant) { $regValue = (Get-ItemProperty -Path "HKLM:\Software\Policies\Microsoft\Windows\Installer" -ErrorAction SilentlyContinue).DisableLUAPatching; if ($regValue -eq 1) { Write-Output "PASS"; exit 0 } } Write-Output "FAIL"; exit 1

Remediation

Configure the policy value for Computer Configuration -> Administrative Templates -> Windows Components -> Windows Installer -> "Prohibit non-administrators from applying vendor signed updates" to "Enabled".