OverTheWire Bandit Level 6 Walkthrough

Today we're doing a walkthrough of level 6 of the Bandit CTF wargame hosted at OverTheWire.org.  First, let's take a look at the objectives for the level:

https://overthewire.org/wargames/bandit/bandit7.html


The level is asking us to locate a file somewhere on the server and has the following properties:

owned by the user bandit7
owned by the group bandit6
33 bytes in size

With that in mind, let's use SSH to login to the game server.  Don't forget to use the Flag from the previous level as the SSH password.

ssh bandit6@bandit.labs.overthewire.org -p 2220


Now let's check what directory we start out in:

pwd


The basic concept of this level is similar to the previous one, but at a larger scale.  We can use the find command to locate the file we're looking for.  We can use the / option to search the entire server, the -size switch to look for a file that is 33 bytes large, the -user switch to look for a file that is owned by bandit7, and the -group switch to find a file that is owned by the bandit6 group.  Lastly, we'll add 2>/dev/null to the end of the command so we don't receive error messages when we try to access files that are forbidden to us.

find / -size 33c -user bandit7 -group bandit6 2>/dev/null


Now that we've located the file that matches all of the criteria, let's cat it out and get the Flag for this level:

cat /var/lib/dpkg/info/bandit7.password


Summary

Bandit6 requires us to search for a specific file on the server that matches a number of different properties.  Once located, we are able to access the file to locate the Flag for the level.

Finish


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