WordPress 4.5.3 Cross Site Scripting
Posted on 09 September 2016
------------------------------------------------------------------------ Persistent Cross-Site Scripting vulnerability in WordPress due to unsafe processing of file names ------------------------------------------------------------------------ Han Sahin, July 2016 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ A persistent Cross-Site Scripting (XSS) vulnerability has been found in WordPress. An attacker can create a specially crafted image file name which, when uploaded in WordPress, injects malicious JavaScript code into the application. An attacker can use this vulnerability to perform a wide variety of actions, such as stealing victims' session tokens or login credentials, and performing arbitrary actions on their behalf. ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160724-0018 ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was successfully tested on WordPress 4.5.3. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ This vulnerability is resolved in WordPress 4.6.1 (Release Notes). ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ https://sumofpwn.nl/advisory/2016/persistent_cross_site_scripting_vulnerability_in_wordpress_due_to_unsafe_processing_of_file_names.html When an image with a file name such as cengizhansahinsumofpwn<img src=a onerror=alert(document.cookie)>.jpg is uploaded and viewed within WordPress the script code is executed ------------------------------------------------------------------------ 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.
