exploit-exercises

http://exploit-exercises.com/ 

단계별로 아래와 같이 있다.

1. Nebula

2. Protostar 

3. Fusion 

* ssh 원격 방법

Getting root

In case you need root access to change stuff (such as key mappings, etc), you can do the following:

Log in as the "nebula" user account with the password "nebula" (both without quotes), followed by "sudo -s" with the password "nebula". You'll then have root privileges in order to change whatever needs to be changed.

# ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key

# ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key