OverTheWire: Bandit Level 11 → Level 12
The Bandit wargames are aimed at absolute beginners. It will teach the basics needed to be able to play other wargames.
Level Goal
The password for the next level is stored in the file data.txt, where all lowercase (a-z) and uppercase (A-Z) letters have been rotated by 13 positions
Commands you may need to solve this level
grep, sort, uniq, strings, base64, tr, tar, gzip, bzip2, xxd
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> 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
Tr Command in Linux with Examples | Linuxize
Solution
View the contents of the current working directory
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bandit11@bandit:~$ ls
data.txt
View the data that is present in the file
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bandit11@bandit:~$ cat data.txt
Gur cnffjbeq vf 5Gr8L4qetPEsPk8htqjhRK8XSP6x2RHh
We know that the characters in the data are rotated by 13 characters. We can get the characters to their original order using the tr command. The tr command is used to translate/ transform data from one form to another.
(Refer to the attached resources for more information on the tr command)
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bandit11@bandit:~$ cat data.txt | tr 'A-Za-z' 'N-ZA-Mn-za-m'
The password is 5Te8Y4drgCRfCx8ugdwuEX8KFC6k2EUu
We have found the password for the next level !!
Logout of the current session and use the password of user bandit12 to access the next level
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> ssh bandit12@bandit.labs.overthewire.org -p 2220
This is a OverTheWire game server. More information on http://www.overthewire.org/wargames
bandit12@bandit.labs.overthewire.org's password: 5Te8Y4drgCRfCx8ugdwuEX8KFC6k2EUu