S800 Vehicle Network Security Testing

reason-machines/security-skills/skills/s800-vehicle-network-security-testing

by reason-machines304c245fe992No license11 starsListed Oct 9, 2026Updated Oct 9, 2026Repository updated 2 months ago

Vehicle network security testing framework for automotive CAN bus and network protocol analysis

Instructions onlySecurity
AI-generated overview

Guides automotive CAN bus and vehicle network security testing, covering traffic capture, fuzzing, ECU scanning, replay and UDS diagnostics.

What it does
This skill provides instructions and Python usage examples for a vehicle network security testing framework covering CAN bus, LIN and FlexRay protocols. It describes capturing and analyzing traffic, fuzzing CAN IDs, fingerprinting ECUs, replaying recorded sessions, bridging interfaces for man-in-the-middle modification, UDS diagnostics, anomaly detection and automated security assessment with HTML reporting. It also covers configuration files, CLI commands, environment variables, troubleshooting and legal warnings.
When to use it
Use it when planning or documenting authorized security assessments of automotive networks, such as CAN traffic analysis, ECU discovery, protocol fuzzing or replay testing. It suits automotive security researchers and penetration testers working with CAN hardware or virtual CAN interfaces. It is not intended for unauthorized testing of vehicles or systems.
Requirements
Python 3.7 or higher, SocketCAN kernel modules on Linux, a CAN hardware interface or virtual CAN interface, and root/sudo access for interface configuration. It references Python packages such as python-can and system tools can-utils, plus optional environment variables for interface, config path, output directory and a remote analysis API endpoint with an API key. The skill contains instructions only and no scripts.

S800 Vehicle Network Security Testing Framework

Skill by ara.so — Security Skills collection.

Overview

S800 is a vehicle network security testing framework designed for automotive security researchers and penetration testers. It provides tools for analyzing, testing, and securing automotive networks including CAN bus, LIN, FlexRay, and other vehicle communication protocols. The framework enables security assessment of Electronic Control Units (ECUs), protocol fuzzing, traffic analysis, and vulnerability discovery in automotive systems.

Note: This is a testing framework. Only use on vehicles and systems you have explicit authorization to test. Unauthorized vehicle network testing may be illegal and dangerous.

Installation

Prerequisites

  • Python 3.7 or higher
  • SocketCAN kernel modules (Linux)
  • CAN hardware interface (USB-to-CAN adapter, OBD-II dongle, etc.)
  • Root/sudo access for network interface configuration

Basic Installation

bash
# Clone the repositorygit clone https://github.com/zhu-zhu666/S800-Vehicle-Network-Security-Testing-Framework.gitcd S800-Vehicle-Network-Security-Testing-Framework
# Install Python dependenciespip install -r requirements.txt
# Install system dependencies (Ubuntu/Debian)sudo apt-get updatesudo apt-get install can-utils python3-can

Hardware Setup

bash
# Load SocketCAN kernel modulessudo modprobe cansudo modprobe can_rawsudo modprobe vcan
# Setup virtual CAN interface (for testing without hardware)sudo ip link add dev vcan0 type vcansudo ip link set up vcan0
# Setup physical CAN interface (example with slcan)sudo slcand -o -c -s6 /dev/ttyUSB0 can0sudo ip link set up can0
# Set CAN bitrate (common automotive: 500kbps)sudo ip link set can0 type can bitrate 500000

Core Components

1. CAN Bus Analyzer

Capture and analyze CAN bus traffic:

python
from s800.can_analyzer import CANAnalyzerfrom s800.utils import setup_interface
# Initialize analyzeranalyzer = CANAnalyzer(interface='can0')
# Start capturing trafficanalyzer.start_capture(duration=60)  # Capture for 60 seconds
# Analyze captured framesstats = analyzer.get_statistics()print(f"Total frames: {stats['total_frames']}")print(f"Unique IDs: {stats['unique_ids']}")print(f"Average data rate: {stats['avg_rate']} frames/sec")
# Export captured dataanalyzer.export_pcap('capture.pcap')analyzer.export_csv('capture.csv')

2. Protocol Fuzzer

Fuzz CAN messages to discover vulnerabilities:

python
from s800.fuzzer import CANFuzzerfrom s800.payloads import PayloadGenerator
# Initialize fuzzerfuzzer = CANFuzzer(interface='can0')
# Define target CAN ID rangetarget_ids = range(0x100, 0x200)
# Generate mutation-based payloadspayload_gen = PayloadGenerator()payloads = payload_gen.generate_mutations(    base_data=[0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07],    mutation_rate=0.3,    count=1000)
# Run fuzzing campaignfuzzer.fuzz(    can_ids=target_ids,    payloads=payloads,    delay=0.01,  # 10ms between frames    monitor=True,  # Monitor for anomalies    callback=lambda result: print(f"Sent: {result}"))

3. ECU Identification

Identify and fingerprint ECUs on the network:

python
from s800.ecu_scanner import ECUScannerfrom s800.diagnostics import UDSClient
# Scan for active ECUsscanner = ECUScanner(interface='can0')ecus = scanner.scan_range(0x700, 0x7FF)
print(f"Found {len(ecus)} ECUs:")for ecu in ecus:    print(f"  ID: 0x{ecu['id']:03X}, Type: {ecu['type']}")
# Query ECU information via UDS (ISO 14229)uds = UDSClient(interface='can0', ecu_id=0x7E0)
# Read DID (Data Identifier)vin = uds.read_data_by_id(0xF190)  # VINprint(f"VIN: {vin.decode()}")
# Read diagnostic trouble codesdtcs = uds.read_dtc()print(f"Diagnostic Trouble Codes: {dtcs}")

4. Replay Attack

Record and replay CAN traffic:

python
from s800.replay import CANReplayimport time
# Record sessionrecorder = CANReplay(interface='can0')print("Recording traffic... Press Ctrl+C to stop")
try:    recorder.start_recording()    time.sleep(30)  # Record for 30 secondsexcept KeyboardInterrupt:    pass
recorder.stop_recording()recorder.save_session('door_unlock_sequence.s800')
# Replay recorded sessionreplayer = CANReplay(interface='can0')replayer.load_session('door_unlock_sequence.s800')
# Replay with original timingreplayer.replay(preserve_timing=True)
# Replay at faster speedreplayer.replay(speed_multiplier=2.0)
# Replay single frame repeatedlyreplayer.replay_frame(index=15, count=100, interval=0.05)

5. Man-in-the-Middle

Intercept and modify CAN traffic:

python
from s800.mitm import CANBridgefrom s800.filters import MessageFilter
# Create bridge between two CAN interfacesbridge = CANBridge(interface_a='can0', interface_b='can1')
# Define filtering rulesdef modify_speed(msg):    """Modify speed data (example: reduce displayed speed)"""    if msg.arbitration_id == 0x320:  # Speed message ID        # Modify byte 3-4 (speed value)        speed = int.from_bytes(msg.data[2:4], byteorder='big')        new_speed = int(speed * 0.8)  # Reduce by 20%        msg.data[2:4] = new_speed.to_bytes(2, byteorder='big')    return msg
# Add filterbridge.add_filter(modify_speed)
# Block specific messagesbridge.block_id(0x400)  # Block messages with ID 0x400
# Start bridgingbridge.start()

Configuration

Configuration File (config.yaml)

yaml
interfaces:  primary: can0  secondary: can1  virtual: vcan0
capture:  buffer_size: 10000  auto_save: true  output_dir: ./captures/
fuzzer:  default_delay: 0.01  max_iterations: 10000  crash_detection: true  anomaly_threshold: 5.0
scanner:  timeout: 1.0  retry_count: 3  id_range:    start: 0x000    end: 0x7FF
uds:  default_timeout: 2.0  session_type: extended  # default, extended, programming  security_access: false
logging:  level: INFO  file: s800.log  console: true

Load configuration:

python
from s800.config import Config
config = Config.load('config.yaml')analyzer = CANAnalyzer(    interface=config.interfaces['primary'],    buffer_size=config.capture['buffer_size'])

Advanced Usage

Custom Protocol Analysis

python
from s800.protocols import ProtocolDecoder
class CustomProtocolDecoder(ProtocolDecoder):    """Decode proprietary protocol"""        def decode(self, msg):        if msg.arbitration_id == 0x300:            return {                'type': 'sensor_data',                'temperature': msg.data[0] - 40,  # Offset by 40                'pressure': int.from_bytes(msg.data[1:3], 'big') / 10,                'status': msg.data[3]            }        return None
# Use custom decoderanalyzer = CANAnalyzer(interface='can0')analyzer.add_decoder(CustomProtocolDecoder())analyzer.start_capture()

Anomaly Detection

python
from s800.ml import AnomalyDetector
# Train baseline modeldetector = AnomalyDetector()detector.train_from_pcap('normal_traffic.pcap')
# Real-time anomaly detectionanalyzer = CANAnalyzer(interface='can0')
def check_anomaly(msg):    if detector.is_anomaly(msg):        print(f"ANOMALY DETECTED: ID=0x{msg.arbitration_id:03X}")        print(f"  Data: {msg.data.hex()}")        # Take action (log, alert, block, etc.)
analyzer.add_callback(check_anomaly)analyzer.start_capture()

Automated Security Assessment

python
from s800.assessment import SecurityAssessment
# Run comprehensive security assessmentassessment = SecurityAssessment(interface='can0')
results = assessment.run_all_tests(    tests=[        'ecu_discovery',        'uds_services',        'authentication_bypass',        'replay_protection',        'fuzzing_resilience'    ],    report_format='html')
assessment.save_report('security_report.html')print(f"Assessment complete. Score: {results['security_score']}/100")

CLI Commands

Basic Commands

bash
# Capture CAN trafficpython s800.py capture -i can0 -d 60 -o capture.pcap
# Scan for ECUspython s800.py scan -i can0 --range 0x700-0x7FF
# Fuzz CAN IDspython s800.py fuzz -i can0 --ids 0x100-0x200 --count 1000
# Replay trafficpython s800.py replay -i can0 -f capture.pcap --speed 1.0
# UDS diagnosticspython s800.py uds -i can0 --ecu 0x7E0 --read-vin
# Run security assessmentpython s800.py assess -i can0 --output report.html

Advanced Commands

bash
# MITM with filteringpython s800.py mitm -a can0 -b can1 --block 0x400 --modify speed_reducer.py
# Export analysispython s800.py analyze -f capture.pcap --export csv --stats
# Differential analysispython s800.py diff baseline.pcap test.pcap --threshold 0.05

Environment Variables

bash
# Default CAN interfaceexport S800_INTERFACE=can0
# Configuration file pathexport S800_CONFIG=/etc/s800/config.yaml
# Output directoryexport S800_OUTPUT_DIR=/var/log/s800/
# Debug modeexport S800_DEBUG=1
# API endpoint (if using remote analysis)export S800_API_URL=https://analysis.example.comexport S800_API_KEY=your_api_key_here

Common Patterns

Pattern 1: Pre-Test Baseline Capture

python
# Always capture baseline before testingbaseline = CANAnalyzer(interface='can0')baseline.start_capture(duration=300)  # 5 minutesbaseline.save('baseline.pcap')
# Run tests# ...
# Compare with baselinetest_capture = CANAnalyzer(interface='can0')test_capture.start_capture(duration=60)diff = test_capture.compare_with('baseline.pcap')print(f"New messages: {diff['new_ids']}")

Pattern 2: Safe Fuzzing

python
# Monitor system health during fuzzingfrom s800.monitoring import SystemMonitor
monitor = SystemMonitor(interface='can0')fuzzer = CANFuzzer(interface='can0')
monitor.add_safety_check('ecu_response', timeout=5.0)monitor.add_safety_check('error_frames', threshold=10)
fuzzer.set_safety_monitor(monitor)fuzzer.fuzz(can_ids=[0x100], payloads=payloads, emergency_stop=True)

Troubleshooting

CAN Interface Not Found

bash
# Check interface statusip link show can0
# Verify kernel moduleslsmod | grep can
# Check dmesg for errorsdmesg | grep can

Permission Denied

bash
# Add user to dialout group (for USB devices)sudo usermod -a -G dialout $USER
# Run with sudo (temporary)sudo python s800.py capture -i can0

No Traffic Received

python
# Verify bitrate matches vehiclesudo ip link set can0 type can bitrate 500000
# Check for bus-off statecandump can0 -e  # Show error frames
# Test with cansendcansend can0 123#DEADBEEF

High Bus Load

python
# Limit capture rateanalyzer = CANAnalyzer(interface='can0', filter_ids=[0x100, 0x200])
# Use hardware filtering if availableanalyzer.set_hardware_filter(mask=0x700, match=0x300)

Safety and Legal Warnings

  • Only test systems you own or have written authorization to test
  • Never test on public roads or active vehicles
  • Automotive systems control safety-critical functions
  • Improper testing can cause vehicle damage or safety hazards
  • Always have emergency stop procedures in place
  • Consult legal counsel before testing automotive systems

Resources

Source and attribution

Source:reason-machines/security-skillsinskills/s800-vehicle-network-security-testingat commit304c245

License: No license

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