------------------------------------------------------------------------ Cross-Site Scripting in Magic Fields 1 WordPress Plugin ------------------------------------------------------------------------ Burak Kelebek, July 2016 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ A reflected Cross-Site Scripting vulnerability has been encountered in the Magic Fields 1 WordPress 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. ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160724-0019 ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was successfully tested on Magic Fields 1 version 1.7.1. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ This issue is addressed in the 1.7.2 version of Magic Fields 1. You can obtain the most recent version on the following location: https://github.com/hunk/Magic-Fields/releases ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ https://sumofpwn.nl/advisory/2016/cross_site_scripting_in_magic_fields_1_wordpress_plugin.html Cross-Site Scripting (XSS) attacks are a type of injection, in which malicious scripts are injected into otherwise benign and trusted websites. XSS attacks occur when an attacker uses a web application to send malicious code, generally in the form of a browser script, to a different end user. Flaws that allow these attacks to succeed are quite widespread and occur when a web application uses input from a user without validating or encoding it. Reflected XSS occurs when user input is immediately returned by a web application in an error message, search result, or any other response that includes some or all of the input provided by the user as part of the request. The plugin has several instances where XSS is possible due to lacking output encoding and user input sanitization: 1. The custom-write-panel-id field does not validate &mf_action=finish-create-custom-field ------------------------------------------------------------------------ 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.