lm-ntlmv1-authentication-enabled: LM and NTLMv1 Authentication Enabled

id: lm-ntlmv1-authentication-enabled

info:
  name: LM and NTLMv1 Authentication Enabled
  author: princechaddha
  severity: high
  description: Checks if LM and NTLMv1 authentication protocols are enabled, which are insecure.
  impact: |
    Legacy authentication methods such as LM and NTLMv1 are vulnerable to brute-force and pass-the-hash attacks.
  remediation: |
    Disable LM and NTLMv1 and enforce NTLMv2 or Kerberos for secure authentication.
  tags: lm,ntlmv1,authentication,code,windows-audit

self-contained: true

code:
  - pre-condition: |
      IsWindows();
    engine:
      - powershell
      - powershell.exe
    args:
      - -ExecutionPolicy
      - Bypass
    pattern: "*.ps1"
    source: |
      $level = (Get-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Lsa' -Name 'LmCompatibilityLevel' -ErrorAction SilentlyContinue).LmCompatibilityLevel; if ($level -lt 3 -or $level -eq $null) { if ($level -eq $null) {"LM Compatibility Level is not set"} else {"LM Compatibility Level is misconfigured (current value: $level)"}} else {"LM Compatibility Level is securely configured (current value: $level)"}

    matchers:
      - type: word
        words:
          - "LM Compatibility Level is misconfigured"
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