source: http://www.securityfocus.com/bid/60782/info

Barnraiser Prairie is prone to a directory-traversal vulnerability because it fails to properly sanitize user-supplied input.

Remote attackers can use specially crafted requests with directory-traversal sequences ('../') to access arbitrary images in the context of the application. This may aid in further attacks. 

http://www.example.com/get_file.php?avatar=..&width=../../../../../../../../usr/share/apache2/icons/apache_pb.png