Modern Debian/Ubuntu MySQL packaging doesn't even do that. It defaults to Unix socket authentication, and so you can only log in if you are actually root on the

Modern Debian/Ubuntu MySQL packaging doesn't even do that. It defaults to Unix socket authentication, and so you can only log in if you are actually root on the system (eg. if you use "sudo mysql"). It does also only bind to 127.0.0.1 by default as you say.