id: prototype-pollution-check

info:
  name: Prototype Pollution Check
  author: pdteam
  severity: medium
  tags: headless

headless:
  - steps:
      - args:
          url: "{{BaseURL}}?constructor[prototype][vulnerableprop]=polluted#constructor[prototype][vulnerableprop]=polluted"
        action: navigate

      - action: waitload

      - action: script
        name: extract
        args:
          code: |
            () => {
             return window.vulnerableprop
            }

    matchers:
      - type: word
        part: extract
        words:
          - "polluted"
  - steps:
      - args:
          url: "{{BaseURL}}?constructor.prototype.vulnerableprop=polluted#constructor.prototype.vulnerableprop=polluted"
        action: navigate

      - action: waitload

      - action: script
        name: extract2
        args:
          code: |
            () => {
             return window.vulnerableprop
            }

    matchers:
      - type: word
        part: extract2
        words:
          - "polluted"

  - steps:
      - args:
          url: "{{BaseURL}}?__proto__[vulnerableprop]=polluted#__proto__.vulnerableprop=polluted&__proto__[vulnerableprop]=polluted"
        action: navigate

      - action: waitload

      - action: script
        name: extract3
        args:
          code: |
            () => {
             return window.vulnerableprop
            }

    matchers:
      - type: word
        part: extract3
        words:
          - "polluted"
  - steps:
      - args:
          url: "{{BaseURL}}?__proto__.vulnerableprop=polluted"
        action: navigate

      - action: waitload

      - action: script
        name: extract4
        args:
          code: |
            () => {
             return window.vulnerableprop
            }

    matchers:
      - type: word
        part: extract4
        words:
          - "polluted"