------------------------------------------------------------------------ Popup by Supsystic WordPress plugin vulnerable to Cross-Site Request Forgery ------------------------------------------------------------------------ Radjnies Bhansingh, July 2016 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ A Cross-site Request Forgery vulnerablity exists in the Popup by Supsystic WordPress Plugin. This vulnerablity allows attackers to add and modify scripting code that will target authenticated WordPress admins or visitors that see the popup generated by this plugin. Before exploitation of this issue succeeds, and scripting code is therefore injected, a victim WordPress admin to click a specially crafted link or visit a malicious attacker-controlled webpage. ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160724-0013 ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was succesfully tested on the Popup by Supsystic [2] WordPress plugin version 1.7.6. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ There is currently no fix available. ------------------------------------------------------------------------ Introduction ------------------------------------------------------------------------ The aim of the Popup by Supsystic [2] WordPress plugin is to help you get more newsletter subscribers, promote new products, deliver special offers and to get more social followers. A Cross-site Request Forgery vulnerablity exists in the Popup by Supsystic WordPress Plugin. This vulnerablity allows attackers to add and modify scripting code that will target authenticated admins or visitors that see the popup generated by this plugin. In order to exploit this issue the target user must click a specially crafted link or visit a malicious website (or advertisement). ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ This issue exists because Popup by Supsystic lacks protection against Cross-Site Request Forgery attacks. The following proof of concept code demonstrates this issue: ------------------------------------------------------------------------ References ------------------------------------------------------------------------ [1] https://sumofpwn.nl/advisory/2016/popup_by_supsystic_wordpress_plugin_vulnerable_to_cross_site_request_forgery.html [2] https://wordpress.org/plugins/popup-by-supsystic/