null-session-allowed: Null Session Allowed

id: null-session-allowed

info:
  name: Null Session Allowed
  author: princechaddha
  severity: high
  description: Checks if null sessions are allowed via any entry in the NullSessionPipes registry key, posing a security risk.
  impact: |
    Allowing null sessions can lead to unauthorized access to network resources, increasing vulnerability to attacks.
  remediation: |
    Disable null sessions by ensuring no entries are allowed in the NullSessionPipes registry key.
  tags: windows,null-session,code,windows-audit

self-contained: true

code:
  - pre-condition: |
      IsWindows();
    engine:
      - powershell
      - powershell.exe
    args:
      - -ExecutionPolicy
      - Bypass
    pattern: "*.ps1"
    source: |
      if ((Get-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters' -Name 'NullSessionPipes').NullSessionPipes.Count -gt 0) { "Null sessions are allowed" }

    matchers:
      - type: word
        words:
          - "Null sessions are allowed"
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