Fancy Product Designer | WooCommerce WordPress <= 6.4.8 - Unauthenticated Server-Side Request Forgery via Race Condition

Vulnerability Description

The Fancy Product Designer plugin for WordPress is vulnerable to Server-Side Request Forgery in all versions up to, and including, 6.4.8. This is due to a time-of-check/time-of-use (TOCTOU) race condition in the 'url' parameter of the fpd_custom_uplod_file AJAX action. The plugin validates the URL by calling getimagesize() first, then later retrieves the same URL using file_get_contents(). This makes it possible for unauthenticated attackers to exploit the timing gap to perform SSRF attacks by serving a valid image during validation, then changing the response to redirect to arbitrary internal or external URLs during the actual fetch.

References

• https://www.wordfence.com/threat-intel/vulnerabilities/id/c56ec6ae-5b75-4cbb-aedd-f318fddc7bf0?source=cve
• https://support.fancyproductdesigner.com/support/discussions/topics/13000036024