Greenhorn HTB is a Hack The Box (HTB) machine, a popular virtual lab for penetration testing and vulnerability assessment. Hack The Box is an online platform that provides a range of virtual machines, each with a unique set of vulnerabilities and challenges. Greenhorn HTB is an entry-level machine, designed for beginners to practice their hacking skills. It is a Linux-based machine with easy difficulty level, making it an excellent starting point for those new to penetration testing and vulnerability assessment. The challenge consists of a web application with various vulnerabilities and flaws, which participants must exploit and remediate to earn points and badges.
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Greenhorn is an excellence stepping stone for those new to web application security and looking to improve their skills in a simulated, safe, and educational environment.
Video Description
This video description shows how to pwn GreenHorn machine on Hack The Box through a walkthrough tutorial on how to complete the machine, including identifying vulnerabilities, exploiting them, and navigating through the network to achieve the goal. The video may also provide tips and tricks for overcoming obstacles and achieving success on the machine.
About the Exploit
A vulnerability has been found in Pluck CMS 4.7.18 and classified as problematic. Pluck version 4.7.18 suffers from a remote code execution vulnerability. This vulnerability affects unknown code of the file install.php of the component Installation Handler. The manipulation of the argument contents with the input scriptalert('xss')/script leads to cross site scripting. The attack can be initiated remotely. The complexity of an attack is rather high.
Description of the Exploit
The attacker who already has an account can upload a fake module to the system and can execute the content from this module on the server. In this example, the attacker executes an info file from the already fake uploaded module and gets all information for this system. This is a CRITICAL Vulnerability. The problem is that these developers are not making a strong sanitizing upload function and do not restrict the execution from inside of the server.
Step-by-Step Walkthrough
1. Connect to the lab access file by typing sudo openvpn boardlight.ovpn - This will establish a connection between Kali Linux terminal and Hack the Box server.
2. Scan for open ports by performing nmap enumeration using nmap -sCV -A 10.10.11.11
3. Add the ip address and domain name to the /etc/hosts file and visit 10.10.11.11 on your browser in your Kali Linux
4. Perform subdomain enumeration using gobuster dns -d “boardlight.htb” -w /usr/share/seclists/Discovery/DNS/subdomains-top1million-20000.txt -t 100 - After the scanning for domain bordlight.htb, crm.board.htb was found. Visit the website and login using common default credentials of admin admin as the username and password
5. Run ssh larissa@10.10.11.11 to obtain a reverse shell at user larissa and list all the files/directories in the shell. There you will find user.txt file, read the file to get the user flag.
6. In the shell, run the following command: find / -type f -perm -u=s 2 /dev/null command in Linux to searches for executable files (type "f") that have the set-user-id (SUID) bit set (permission "u=s"). The 2 /dev/null redirection sends any errors to the null device, effectively suppressing them. This command is useful for finding system binaries or scripts that can be executed with elevated privileges.
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