------------------------------------------------------------------------ Persistent Cross-Site Scripting in Magic Fields 2 WordPress Plugin ------------------------------------------------------------------------ Burak Kelebek, July 2016 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ A Cross-Site Scripting vulnerability was found in the Magic Fields 2 plugin. This issue allows an attacker to perform a wide variety of actions, such as stealing Administrators' session tokens, or performing arbitrary actions on their behalf. In order to exploit this issue, the attacker has to lure/force a logged on WordPress Administrator into opening a malicious website. ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160724-0017 ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was successfully tested on Magic Fields 2 version 2.3.2.4. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ This issue is fixed in version 2.3.3 ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ https://sumofpwn.nl/advisory/2016/persistent_cross_site_scripting_in_magic_fields_2_wordpress_plugin.html The Magic Fields plugin lacks a CSRF (nonce) token on the request of adding a magic field. The magic field lacks output encoding which could result in malicious script inserted by an attacker. You need to lure a logged-in admin to follow a malicious link containing the poc below. Proof of concept The proof of concept below injects script code in the "Login Required Message" in the settings page. ------------------------------------------------------------------------ Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its goal is to contribute to the security of popular, widely used OSS projects in a fun and educational way.