id: pgsql-detect

info:
  name: PostgreSQL Authentication - Detect
  author: nybble04
  severity: info
  description: |
    PostgreSQL authentication error messages which could reveal information useful in formulating further attacks were detected.
  reference:
    - https://www.postgresql.org/docs/current/errcodes-appendix.html
    - https://www.postgresql.org/docs/current/client-authentication-problems.html
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N
    cwe-id: CWE-200
  metadata:
    max-request: 1
    shodan-query: port:5432 product:"PostgreSQL"
    verified: true
  tags: network,postgresql,db,detect

tcp:
  - inputs:
      - data: "000000500003000075736572006e75636c6569006461746162617365006e75636c6569006170706c69636174696f6e5f6e616d65007073716c00636c69656e745f656e636f64696e6700555446380000"
        type: hex
      - data: "7000000036534352414d2d5348412d32353600000000206e2c2c6e3d2c723d000000000000000000000000000000000000000000000000"
        type: hex

    host:
      - "{{Hostname}}"
    port: 5432
    read-size: 2048

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "28000"                   # Error code for invalid_authorization_specification
          - "28P01"                   # Error code for invalid_password
          - "SCRAM-SHA-256"           # Authentication prompt
          - "pg_hba.conf"             # Client authentication config file
          - "user \"nuclei\""         # The user nuclei (sent in request) doesn't exist
          - "database \"nuclei\""     # The db nuclei (sent in request) doesn't exist"
        condition: or

      - type: word
        words:
          - "HTTP/1.1"
        negative: true