OverTheWire

OverTheWire: Bandit Level 10 → Level 11

https://overthewire.org/wargames/bandit/bandit11.html

Level Goal

The password for the next level is stored in the file data.txt, which contains base64 encoded data

Commands you may need to solve this level

grep, sort, uniq, strings, base64, tr, tar, gzip, bzip2, xxd

> whatis grep
grep (1)             - print lines that match patterns
> whatis sort
sort (1)             - sort lines of text files
> whatis uniq
uniq (1)             - report or omit repeated lines
> whatis strings
strings (1)          - print the sequences of printable characters in files
> whatis base64
base64 (1)           - base64 encode/decode data and print to standard output
> whatis tr
tr (1)               - translate or delete characters
> whatis tar
tar (1)              - an archiving utility
> whatis gzip
gzip (1)             - compress or expand files
> whatis bzip2
bzip2 (1)            - a block-sorting file compressor, v1.0.8
> whatis xxd
xxd (1)              - make a hexdump or do the reverse.

Note : All commands don’t have to be used to complete level

Helpful Reading Material

Base64

Bash base64 encode and decode

Solution

View the contents of the current working directory

bandit10@bandit:~$ ls
data.txt

View the data that is present in the file

bandit10@bandit:~$ cat data.txt
VGhlIHBhc3N3b3JkIGlzIElGdWt3S0dzRlc4TU9xM0lSRnFyeEUxaHhUTkViVVBSCg==

Looking at the content it looks like an string of random characters but from the question we know that the data is base64 encoded. We can decode this data using the base64 command that is present on *nix systems. The -d flag is used to decode the data

(For detailed information on base64 encoding refer the attached article)

bandit10@bandit:~$ cat data.txt | base64 -d
The password is IFukwKGsFW8MOq3IRFqrxE1hxTNEbUPR

We have found the password for the next level !!

Logout of current session and use password of user bandit11 to access next level

> ssh bandit11@bandit.labs.overthewire.org -p 2220
This is a OverTheWire game server. More information on http://www.overthewire.org/wargames
bandit11@bandit.labs.overthewire.org's password: IFukwKGsFW8MOq3IRFqrxE1hxTNEbUPR

Previous Level

OverTheWire: Bandit Level 9 → Level 10

Next Level

OverTheWire: Bandit Level 11 → Level 12