dns-rebinding: DNS Rebinding Attack

id: dns-rebinding
info:
  name: DNS Rebinding Attack
  author: ricardomaia
  severity: unknown
  description: |
    Detects DNS Rebinding attacks by checking if the DNS response contains a private IPv4 or IPv6 address.
  reference:
    - https://capec.mitre.org/data/definitions/275.html
    - https://payatu.com/blog/dns-rebinding/
    - https://heimdalsecurity.com/blog/dns-rebinding/
  metadata:
    max-request: 2
  tags: redirect,dns,network,discovery

dns:
  - name: "{{FQDN}}"
    type: A
    matchers:
      # IPv4
      - type: regex
        part: answer
        regex:
          - 'IN\s+A\s+(127\.0\.0\.1|10\.\d{1,3}\.\d{1,3}\.\d{1,3}|172\.(1[6-9]|2\d|3[0-1])\.\d{1,3}\.\d{1,3}|192\.168\.\d{1,3}\.\d{1,3})$'

    extractors:
      - type: regex
        part: answer
        name: IPv4
        group: 1
        regex:
          - 'IN\s+A\s+(127\.0\.0\.1|10\.\d{1,3}\.\d{1,3}\.\d{1,3}|172\.(1[6-9]|2\d|3[0-1])\.\d{1,3}\.\d{1,3}|192\.168\.\d{1,3}\.\d{1,3})'

  - name: "{{FQDN}}"
    type: AAAA
    matchers:
      # IPv6 Compressed and Full
      - type: regex
        part: answer
        regex:
          - "IN\\s+AAAA\\s+(fd[0-9a-fA-F]{2}(:[0-9a-fA-F]{0,4}){0,7})"

    extractors:
      - type: regex
        part: answer
        name: IPv6_ULA
        group: 1
        regex:
          - "IN\\s+AAAA\\s+(fd[0-9a-fA-F]{2}(:[0-9a-fA-F]{0,4}){0,7})"
# digest: 4a0a00473045022100ac451bbde4048889b3f7dc0bec3cbb9c9abb869124583b1cd69761fe53addaf00220510640413804275277c5a3671c53aed13cc418afc28837ae3994e644aa6fa904:922c64590222798bb761d5b6d8e72950