The Leviathan server on OvertheWire is generally recommended after completing the Bandit sever. This server also deals with Linux commands and requires no programming experience. This server is a little harder because there is no explanation of what to do in the levels. While the server is listed as a 1/10 difficulty level, the novice will find it more difficult than bandit. Leviathan is not necessarily based on command usage, it’s more so about thought process. I would bump it to a 2/10 or so.
After we are SSH‘ed into Leviathan0’s shell, we should look around. Upon inspection of our home directory, we see a backup directory named to be hidden. Taking a closer look of what is contained in the backup easily reveals the password to get into level 1 and begin leviathan.
leviathan0@melissa:~$ ls -la total 24 drwxr-xr-x 3 root root 4096 2012-06-28 21:23 . drwxr-xr-x 150 root root 4096 2013-01-03 16:39 .. drwxr-x--- 2 root leviathan0 4096 2012-06-28 21:23 .backup -rw-r--r-- 1 root root 220 2011-03-31 23:20 .bash_logout -rw-r--r-- 1 root root 3353 2011-03-31 23:20 .bashrc -rw-r--r-- 1 root root 675 2011-03-31 23:20 .profile leviathan0@melissa:~$ cd .backup leviathan0@melissa:~/.backup$ ls bookmarks.html #Let's look for the word "password" in this file: leviathan0@melissa:~/.backup$ cat bookmarks.html | grep password <DT><A HREF="http://leviathan.labs.overthewire.org/passwordus.html | This will be fixed later, the password for leviathan1 is <strong>rioGegei8m</strong>" ADD_DATE="1155384634"LAST_CHARSET="ISO-8859-1" ID="rdf:#$2wIU71">password to leviathan1
Trying to read the large bookmarks file in our terminal shows way too many bookmarks to make sense of. Selectively search for data you might want. As we can see, the password is hidden within a bookmark description.