Reflected Cross-Site Scripting (XSS) in Google Calendar Events WordPress Plugin

High-Tech Bridge Security Research Lab discovered vulnerability in Google Calendar Events WordPress plugin, which can be exploited to perform Cross-Site Scripting (XSS) attacks against administrator of a WordPress website with vulnerable plugin.

1. Reflected Cross-Site Scripting (XSS) in Google Calendar Events WordPress Plugin: CVE-2014-7138

Input passed via the “gce_feed_ids” HTTP GET parameter to “/wp-admin/admin-ajax.php” script is not properly sanitised before being returned to the user. A remote attacker can trick a logged-in administrator to open a specially crafted link and execute arbitrary HTML and script code in browser in context of the vulnerable website.

The exploitation example below uses the “alert()” JavaScript function to display “immuniweb” word:

http://wordpress/wp-admin/admin-ajax.php?action=gce_ajax&gce_type=page&gce_f eed_ids=%27%22%3E%3Cscript%3Ealert%28/immuniweb/%29;%3C/script%3E