Counter live visitors for WooCommerce <= 1.3.6 - Unauthenticated Arbitrary File Deletion in wcvisitor_get_block

Vulnerability Description

The Counter live visitors for WooCommerce plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the wcvisitor_get_block function in all versions up to, and including, 1.3.6. This makes it possible for unauthenticated attackers to delete arbitrary files on the server. NOTE: This particular vulnerability deletes all the files in a targeted arbitrary directory rather than a specified arbitrary file, which can lead to loss of data or a denial of service condition.

References

• https://www.wordfence.com/threat-intel/vulnerabilities/id/ae13dc61-c4bf-4b17-8055-98c80a853a2a?source=cve
• https://plugins.trac.wordpress.org/browser/counter-visitor-for-woocommerce/tags/1.3.6/woo-counter-visitor.php#L378
• https://plugins.trac.wordpress.org/changeset/3333208