File Transfer Protocol

• Upgrade WU-FTPD or ProFTPD
Disable anonymouse if no needed
Disable anonymouse upload function if no needed
Restrict access by TCP wrappers
Implement restrictive file permissions
Add all administrative accounts (such as root,   daemon, sys, etc.) to the /etc/ftpusers
Replacing FTP with SFTP or SCP
Disable unused FTP servers completely