FTPサーバに対する攻撃

下記の記事が出ている。

　Thousands of infected FTP servers net attackers $88k in cryptocurrency
　ars technica: September 13, 2016
　http://arstechnica.com/security/2016/09/thousands-of-infected-ftp-servers-net-attackers-88k-in-cryptocurrency/

　4.5 million web servers have private keys that are publicly known!
　Naked Security: 12 September, 2016
　https://nakedsecurity.sophos.com/2016/09/12/4-5-million-web-servers-have-private-keys-that-are-publicly-known/