UDSim
A GUI tool for simulating, learning, and fuzzing UDS (Unified Diagnostic Services) on vehicle CAN buses for security testing and training.
What is UDSim?
UDSim is a graphical simulator and fuzzer for Unified Diagnostic Services (UDS) on vehicle CAN buses. It allows users to monitor CAN traffic, automatically learn connected devices, emulate vehicle modules for testing, and perform security fuzzing on diagnostic tools. It solves the problem of needing physical vehicles or hardware for automotive security research and training.
Automotive security researchers, penetration testers, vehicle diagnostic tool developers, and trainers who need to simulate or test UDS communications without direct access to a vehicle.
Developers choose UDSim for its ability to automatically learn UDS modules from live or recorded CAN traffic, its integrated simulation and fuzzing modes, and its flexibility in supporting both basic testing and integration with advanced fuzzing frameworks like Peach.
Overview
UDSim is a graphical simulator and fuzzer for Unified Diagnostic Services (UDS) on vehicle CAN networks. It enables security researchers, automotive engineers, and trainers to emulate vehicle modules, learn network behavior from live or recorded traffic, and test diagnostic tools for vulnerabilities.
Key Features
- Automatic Learning — Monitors CAN bus traffic to automatically identify and learn UDS-capable modules without prior vehicle knowledge.
- Simulation Mode — Emulates learned vehicle modules, allowing diagnostic tools to function as if connected to a real car, useful for demos and training.
- Built-in Fuzzer — Includes a basic fuzzing system to test devices by manipulating UDS responses, with configurable fuzz levels.
- Peach Fuzzer Integration — Exports learned data to the Peach Fuzzer engine for advanced, structured fuzzing of automotive systems.
- Configurable Modules — Supports custom configuration files to define ECU behavior, positions in the GUI, and response rules.
Philosophy
UDSim is designed as a practical, accessible tool for automotive security research and education, balancing ease of use with the flexibility needed for in-depth testing and simulation.
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