Vulmon
source: http://www.securityfocus.com/bid/9546/info
A vulnerability has been reported in the Crob FTP server, which occurs due to a lack of validation of input from the user. By issuing a specially crafted request, a malevolent user may be able to gain access to files outside of the ftp root directory.
You can read all directories on the system with the following command:
dir ../../../../../*