Challenge Overview

You're a penetration tester hired by FlexoForge Industries, a high-speed automotive parts manufacturer. Their plant runs on a partially automated assembly line, where raw parts are routed by a conveyor belt to various robotic stations. To control the flow of parts and prevent jams, the conveyor relies on traffic light signals (Red, Yellow, Green) at critical junctions. The signals are controlled by a MODBUS TCP/IP-based PLC (Programmable Logic Controller). Any slight misalignment in the timing of these lights can delay or misroute parts, causing fulfilment issues in just a matter of minutes. Recently, the plant reported irregular delays, and your task is to investigate potential vulnerabilities in the traffic light control system. But you're also tasked with demonstrating a controlled exploit-you must take over the lights and cause a specific conveyor pattern to extract the flag. In this CTF, you will play the role of an ethical hacker attempting to control a traffic light system by exploiting SCADA vulnerabilities. Your target is to interact with the traffic light control system, alter its state, and ultimately display a hidden flag that will only appear when the traffic light turns green. Your journey begins with scanning the network to find the live system and continues with using Modbus commands to control the traffic light. Successful manipulation will allow you to access the flag.

What You Will Learn

  • Identifying industrial control systems and services using tools like Nmap.
  • Detecting and validating the presence of Modbus services on the target system.
  • Leveraging Metasploit Modbus modules to interact with and enumerate PLC registers.
  • Writing specific values to Modbus registers to control the traffic light states (Red, Yellow, Green).
  • Demonstrating real-world impact by altering system behavior (turning the light green) to trigger and retrieve the hidden flag.

Program Curriculum

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