su root
http://10.10.10.15/admin Indeed, we find a simple login form. After attempting some common credentials, we manage to log in using the username admin and password password123 .
nmap -sV -p- 10.10.10.15 The scan reveals that ports 22 (SSH), 80 (HTTP), and 8080 (HTTP) are open. We can now focus on exploring these services further.
Hack The Box is a popular online platform that offers a variety of virtual machines (VMs) for cybersecurity enthusiasts to practice their hacking skills. One of the boxes available on the platform is Fish.io, a Linux-based VM that simulates a real-world hacking scenario. In this walkthrough, we'll explore the steps to compromise the Fish.io box and gain root access. hack fish.io
<!-- TODO: move to prod env --> This hint suggests that the website might be running in a non-production environment. We can try to access the /admin directory, which often contains administrative interfaces:
sudo -l We can leverage this configuration to gain root access:
sudo -u fish /bin/bash Switching to the fish user, we find that the user's home directory contains a config file with sensitive information: su root http://10
With administrative access, we can now explore the application's functionality. Upon reviewing the dashboard, we notice a " Upload File" feature. This feature can potentially be used to execute arbitrary code on the server.
You're interested in writing about Hack The Box's Fish.io, I presume?
http://10.10.10.15/uploads/shell.php A meterpreter shell opens, allowing us to navigate the file system and escalate privileges. We can now focus on exploring these services further
Next, we visit the HTTP service running on port 80:
We create a PHP reverse shell using a tool like msfvenom :
To begin, we need to gather information about the target machine. Using the nmap command, we can perform an initial scan to identify open ports and services:
In this walkthrough, we demonstrated how to compromise the Fish.io box on Hack The Box. By identifying open ports, enumerating HTTP services, exploiting a web application vulnerability, and leveraging a misconfigured sudo command, we were able to gain root access to the system. This exercise highlights the importance of secure configuration, input validation, and access control in preventing similar attacks.