Bandit Level 17 → Level 18

 

Goal

There are 2 files in the homedirectory: passwords.old and passwords.new. The password for the next level is in passwords.new and is the only line that has been changed between passwords.old and passwords.new

NOTE: if you have solved this level and see ‘Byebye!’ when trying to log into bandit18, this is related to the next level, bandit19

home 디렉토리에 2개의 파일이 있다: `passwords.old`, `passwords.new`. 다음 레벨의 패스워드는 `passwords.new` 파일에 있고, 이는 `passwords.old` 파일에서 변경된 값이다.

노트: 만약 이 레벨을 해결해 bandit18에 접근하려 하면 'Byebye!'를 보게 될 것이다. 이는 다음 레벨인 bandit19와 관련이 있다.

 

Commands you may need to solve this level

`cat`, `grep`, `ls`, `diff`

 

Write Up

bandit17@bandit:~$ ls -al
total 36
drwxr-xr-x  3 root     root     4096 Oct  5  2023 .
drwxr-xr-x 70 root     root     4096 Oct  5  2023 ..
-rw-r-----  1 bandit17 bandit17   33 Oct  5  2023 .bandit16.password
-rw-r--r--  1 root     root      220 Jan  6  2022 .bash_logout
-rw-r--r--  1 root     root     3771 Jan  6  2022 .bashrc
-rw-r-----  1 bandit18 bandit17 3300 Oct  5  2023 passwords.new
-rw-r-----  1 bandit18 bandit17 3300 Oct  5  2023 passwords.old
-rw-r--r--  1 root     root      807 Jan  6  2022 .profile
drwxr-xr-x  2 root     root     4096 Oct  5  2023 .ssh

bandit17@bandit:~$ file passwords.*
passwords.new: ASCII text
passwords.old: ASCII text

 

두 파일은 모두 ASCII text 파일이다. 눈으로 차이를 비교하려면 시간이 많이 소요되므로 `diff` 명령어를 이용해 두 파일간의 차이를 확인했다. 

bandit17@bandit:~$ diff -c ./passwords.old ./passwords.new

 

bandit18에 해당 플래그로 접근하면 접근이 거부되고 'Byebye!' 로그를 확인할 수 있다.

Byebye !
Connection to bandit.labs.overthewire.org closed.