------------------------------------------------------------------------ Stored Cross-Site Scripting vulnerability in Photo Gallery WordPress Plugin ------------------------------------------------------------------------ Umit Aksu, July 2016 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ A Cross-Site Scripting vulnerability was found in the Photo Gallery by Supsystic WordPress Plugin. This issue allows an attacker to perform a wide variety of actions, such as stealing users' session tokens, or performing arbitrary actions on their behalf. In order to exploit this issue, the attacker has to lure/force a victim into opening a malicious website/link. ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160722-0004 ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was successfully tested on Photo Gallery by Supsystic [2] WordPress Plugin version 1.8.5. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ This issue is resolved in Photo Gallery by Supsystic version 1.8.6 [3]. ------------------------------------------------------------------------ Introduction ------------------------------------------------------------------------ The Photo Gallery by Supsystic [2] WordPress Plugin can be used to create portfolios and image galleries. A Cross-Site Scripting vulnerability was found in the Photo Gallery by Supsystic WordPress Plugin. This issue allows an attacker to perform a wide variety of actions, such as stealing users' session tokens, or performing arbitrary actions on their behalf. In order to exploit this issue, the attacker has to lure/force a victim into opening a malicious website/link. ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ It is possible to deliver a Cross-Site Scripting attack through Cross-Site Request Forgery. The caption text in the gallery is vulnerable to a stored Cross-Site Scripting. The Cross-Site Scripting attack is normaly only exploitable if the attacker has admin privileges. However, no measures are implemented to protect against Cross-Site Request Forgery on the request that saves the image details. Due to this, it is possible to exploit this issue via Cross-Site Request Forgery. ------------------------------------------------------------------------ Proof of concept ------------------------------------------------------------------------ ------------------------------------------------------------------------ References ------------------------------------------------------------------------ [1] https://sumofpwn.nl/advisory/2016/stored_cross_site_scripting_vulnerability_in_photo_gallery_wordpress_plugin.html [2] https://wordpress.org/plugins/gallery-by-supsystic/ [3] https://downloads.wordpress.org/plugin/gallery-by-supsystic.zip