After exploring the file system, we discover that the sudo command has been configured to allow the fish user to run any command without a password:
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 .
http://10.10.10.15/uploads/shell.php A meterpreter shell opens, allowing us to navigate the file system and escalate privileges. hack fish.io
We create a PHP reverse shell using a tool like msfvenom :
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. After exploring the file system, we discover that
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:
su root
cat ~fish/config The file contains a password for the root user. We can now switch to the root user and gain full access to the system:
http://10.10.10.15 The webpage appears to be a simple website with a " Contact Us" form. However, upon inspecting the page source, we notice a peculiar comment: We create a PHP reverse shell using a
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:
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