SV-226055r794768: Windows PowerShell 2.0 must not be installed on Windows 2012/2012 R2. | Microsoft Windows Server 2012/2012 R2 Domain Controller STIG SCAP Benchmark

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Assessment Title

Rule Text

Windows PowerShell 2.0 must not be installed on Windows 2012/2012 R2.

Description

Discussion Text

Windows PowerShell versions 4.0 (with a patch) and 5.x add advanced logging features that can provide additional detail when malware has been run on a system. Ensuring Windows PowerShell 2.0 is not installed as well mitigates against a downgrade attack that evades the advanced logging features of later Windows PowerShell versions.

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

IA Controls

NIST SP 800-53

Not mappedCCI-000381SV-95185V-80477

References

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

Checks

DISA STIG (Manual Reference)

Windows PowerShell 2.0 is not installed by default.

Open "Windows PowerShell".

Enter "Get-WindowsFeature -Name PowerShell-v2".

If "Installed State" is "Installed", this is a finding.

An Installed State of "Available" or "Removed" is not a finding.

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:5193
# Windows PowerShell 2.0 must not be installed on Windows 2012/2012 R2.
# Per-module read mechanism curated from static teardown of DISA's SCC tool
# (SCAP Compliance Checker) -- see the SCC Automation Reference above.

# Verifies the Windows PowerShell 2.0 Engine server feature is not installed
# wmi57_object (wmi57_test)
function test_1 {
  return (((Get-CimInstance -Namespace 'root\cimv2' -Query 'SELECT id FROM win32_serverfeature' | Select-Object -First 1) | Select-Object -ExpandProperty 'id') -eq '411')
}

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:5193
if (!(Get-CimInstance -ClassName Win32_ServerFeature -Filter "Name = 'Windows PowerShell 2.0'").InstallState -eq 4) { Write-Output "FAIL"; exit 1 } else { Write-Output "PASS"; exit 0 }

Remediation

Windows PowerShell 2.0 is not installed by default.

Uninstall it if it has been installed.

Open "Windows PowerShell".

Enter "Uninstall-WindowsFeature -Name PowerShell-v2".

Alternately:

Use the "Remove Roles and Features Wizard" and deselect "Windows PowerShell 2.0 Engine" under "Windows PowerShell".