There is a major PROFTPD vulnerability that affects versions earlier than 1.3.3c
All our shared hosting servers are not running PROFTPD.
If you're running this version under VPS or dedicated server, then you need to upgrade.
See http://goo.gl/yxJOW for more information
ProFTPD bug report: http://bugs.proftpd.org/show_bug.cgi?id=3521