Arbitrary WordPress File Upload Vulnerability and repair

WordPress Arbitrary File Upload Vulnerability

MustLive has discovered a vulnerability in WordPress, which can be exploited by malicious users to compromise a vulnerable system.

The application improperly validates uploaded files, which can be exploited to execute arbitrary PHP code by uploading a. phtml file with e.g. an appended ". gif" file extension.

Successful exploitation requires "Author" permissions in the backend and that Apache is not configured to handle the mime-type for media files with e.g. a ". jpg" or ". gif" extension.

The vulnerability is confirmed in version 3.1.2. Other versions may also be affected.

 

Solution
Restrict access to the wp-content/uploads directory (e.g. via. htaccess ).

Provided and/or discovered
MustLive

Original Advisory

Http://websecurity.com.ua/5108/