linux-anonymous-ftp-enabled: Linux Anonymous FTP Access Enabled

id: linux-anonymous-ftp-enabled

info:
  name: Linux Anonymous FTP Access Enabled
  author: songyaeji
  severity: high
  description: |
    FTP account allows malicious users to exploit it to log in anonymously and write to directories, potentially gaining unauthorized access or executing local exploits.This template checks for signs of anonymous FTP being enabled via /etc/passwd, vsFTPD, or ProFTPD configuration files.
  reference:
    - https://isms.kisa.or.kr
  metadata:
    verified: true
  tags: linux,local,kisa,audit,ftp,anonymous,local

self-contained: true

code:
  - engine:
      - bash
    source: |
      if grep -q -E '^ftp:' /etc/passwd; then
          echo "[VULNERABLE] FTP user exists in /etc/passwd"
      else
          echo "[SAFE] No FTP user found in /etc/passwd"
      fi

      # Check vsftpd anonymous login
      if grep -q -i 'anonymous_enable.*yes' /etc/vsftpd/vsftpd.conf 2>/dev/null; then
          echo "[VULNERABLE] anonymous_enable=YES in vsftpd.conf"
      else
          echo "[SAFE] Anonymous login disabled in vsftpd.conf"
      fi

      # Check proftpd anonymous login
      if grep -q -i 'UserAlias.*anonymous' /etc/proftpd/proftpd.conf 2>/dev/null; then
          echo "[VULNERABLE] UserAlias anonymous in proftpd.conf"
      else
          echo "[SAFE] Anonymous login disabled in proftpd.conf"
      fi

    matchers:
      - type: word
        part: response
        words:
          - "[VULNERABLE]"
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