insecure-powershell-execution-policy: Insecure PowerShell Execution Policy - Detect

id: insecure-powershell-execution-policy

info:
  name: Insecure PowerShell Execution Policy - Detect
  author: JeonSungHyun[nukunga]
  severity: medium
  description: |
    Checks if the PowerShell Execution Policy is set to an insecure level, which could allow unauthorized or malicious scripts to run.
  reference:
    - https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_execution_policies?view=powershell-7.4
  impact: |
    An insecure Execution Policy can allow unauthorized or malicious scripts to execute, increasing the risk of security breaches and system compromise.
  remediation: |
    Set execution policy to RemoteSigned or AllSigned according to your organization's policy.
  tags: windows,powershell,audit,code

self-contained: true

code:
  - pre-condition: |
      IsWindows();
    engine:
      - powershell
      - powershell.exe

    args:
      - -ExecutionPolicy
      - Bypass

    pattern: "*.ps1"

    source: |
      $policies = Get-ExecutionPolicy -List
      foreach ($p in $policies) {
        if ($p.ExecutionPolicy -in @("Bypass", "Unrestricted")) {
           Write-Output "Insecure Execution Policy found: $($p.Scope) - $($p.ExecutionPolicy)"
        }
      }

    matchers:
      - type: word
        words:
          - "Insecure Execution Policy found:"
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