s800-vehicle-network-security-testing

name	s800-vehicle-network-security-testing
description	Security testing framework for automotive vehicle networks including CAN, LIN, and FlexRay protocols
triggers	["test vehicle network security","automotive CAN bus testing","vehicle ECU security assessment","scan car network vulnerabilities","inject CAN messages for testing","fuzzing automotive protocols","analyze vehicle network traffic","test ECU authentication"]

S800 Vehicle Network Security Testing Framework

Skill by ara.so — Security Skills collection.

Overview

S800 is a comprehensive security testing framework designed for automotive vehicle networks. It supports testing and analysis of common automotive protocols including CAN (Controller Area Network), LIN (Local Interconnect Network), and FlexRay. The framework provides tools for network scanning, message injection, fuzzing, traffic analysis, and vulnerability assessment of vehicle Electronic Control Units (ECUs).

Key capabilities:

• CAN/LIN/FlexRay protocol support
• Network traffic capture and analysis
• Message injection and replay attacks
• Protocol fuzzing for vulnerability discovery
• ECU authentication testing
• Diagnostic protocol (UDS/OBD-II) security testing

Installation

Prerequisites

# Install required system dependencies
sudo apt-get update
sudo apt-get install -y can-utils python3-pip git

# Enable CAN kernel modules
sudo modprobe can
sudo modprobe can_raw
sudo modprobe vcan

Framework Installation

# Clone the repository
git clone https://github.com/zhu-zhu666/S800-Vehicle-Network-Security-Testing-Framework.git
cd S800-Vehicle-Network-Security-Testing-Framework

# Install Python dependencies
pip3 install -r requirements.txt

# Set up virtual CAN interface for testing
sudo ip link add dev vcan0 type vcan
sudo ip link set up vcan0

Hardware Setup

For real vehicle testing, connect CAN hardware interface:

# Configure physical CAN interface (e.g., SocketCAN)
sudo ip link set can0 type can bitrate 500000
sudo ip link set up can0

Core Components

Network Scanner

Discover active ECUs and network topology:

from s800.scanner import NetworkScanner
from s800.core import CANInterface

# Initialize CAN interface
interface = CANInterface('can0')

# Create scanner instance
scanner = NetworkScanner(interface)

# Perform network discovery
active_ecus = scanner.scan_network(timeout=10)

for ecu in active_ecus:
    print(f"ECU ID: {ecu.id}, Address: {hex(ecu.address)}")
    print(f"Services: {ecu.supported_services}")

Message Injection

Send crafted CAN messages for testing:

from s800.injection import MessageInjector
from s800.protocols import CANMessage

injector = MessageInjector('can0')

# Single message injection
msg = CANMessage(
    arbitration_id=0x123,
    data=[0x02, 0x10, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00],
    is_extended=False
)
injector.send(msg)

# Burst injection for DoS testing
injector.send_burst(
    arbitration_id=0x7DF,
    data=[0x02, 0x3E, 0x00],
    count=1000,
    interval=0.001  # 1ms between messages
)

Traffic Analysis

Capture and analyze network traffic:

from s800.analysis import TrafficAnalyzer
from s800.capture import PacketCapture

# Start packet capture
capture = PacketCapture('can0')
capture.start()

# Capture for specified duration
packets = capture.capture_duration(seconds=30)

# Analyze captured traffic
analyzer = TrafficAnalyzer(packets)

# Identify periodic messages
periodic = analyzer.find_periodic_messages()
for msg_id, info in periodic.items():
    print(f"ID: {hex(msg_id)}, Period: {info['period']}ms")

# Detect anomalies
anomalies = analyzer.detect_anomalies()
for anomaly in anomalies:
    print(f"Anomaly: {anomaly['type']} at {anomaly['timestamp']}")

Protocol Fuzzing

Automated fuzzing for vulnerability discovery:

from s800.fuzzing import ProtocolFuzzer
from s800.protocols import UDSProtocol

# Initialize UDS fuzzer
fuzzer = ProtocolFuzzer(
    interface='can0',
    protocol=UDSProtocol,
    target_id=0x7E0
)

# Configure fuzzing parameters
fuzzer.set_config({
    'max_iterations': 10000,
    'mutation_rate': 0.3,
    'timeout': 1.0,
    'crash_detection': True
})

# Start fuzzing session
results = fuzzer.fuzz_service(
    service_id=0x27,  # SecurityAccess
    sub_function=0x01,
    seed_data=[0x00, 0x00, 0x00, 0x00]
)

# Review findings
for finding in results.vulnerabilities:
    print(f"Vulnerability: {finding['description']}")
    print(f"Payload: {finding['payload'].hex()}")
    print(f"Response: {finding['response'].hex()}")

UDS (Unified Diagnostic Services) Testing

Session Management

from s800.protocols.uds import UDSSession, SessionType

session = UDSSession(interface='can0', ecu_id=0x7E0)

# Start diagnostic session
session.start_session(SessionType.EXTENDED)

# Attempt security access
seed = session.request_seed(level=0x01)
print(f"Seed received: {seed.hex()}")

# Calculate key (implement your algorithm)
key = calculate_security_key(seed)

# Send key
if session.send_key(level=0x01, key=key):
    print("Security access granted")
    
    # Read data by identifier
    data = session.read_data(identifier=0xF190)  # VIN
    print(f"VIN: {data.decode()}")
    
    # Write data (be careful!)
    # session.write_data(identifier=0x1234, data=b'\x00\x01\x02\x03')

ECU Reprogramming Security

from s800.protocols.uds import Programmer

programmer = Programmer(interface='can0', ecu_id=0x7E0)

# Test reprogramming security
try:
    # Check if ECU allows programming mode
    programmer.request_download(
        address=0x00100000,
        size=0x10000,
        format_identifier=0x00
    )
    
    print("WARNING: ECU accepts reprogramming without proper authentication!")
    
except Exception as e:
    print(f"Programming blocked: {e}")

Configuration

Framework Configuration File

Create config.yaml:

s800:
  interfaces:
    primary: can0
    backup: vcan0
  
  network:
    default_bitrate: 500000
    extended_ids: false
    fd_mode: false
  
  scanner:
    timeout: 10
    retry_count: 3
    ecu_range:
      start: 0x700
      end: 0x7FF
  
  fuzzing:
    max_iterations: 50000
    crash_detection: true
    mutation_strategies:
      - bit_flip
      - byte_flip
      - arithmetic
      - boundary
    
  logging:
    level: INFO
    output: /var/log/s800/testing.log
    capture_packets: true

Load configuration:

from s800.config import load_config

config = load_config('config.yaml')
interface = CANInterface(config['interfaces']['primary'])

Common Testing Patterns

Authentication Bypass Testing

from s800.tests import AuthenticationTest

auth_test = AuthenticationTest(interface='can0')

# Test seed-key algorithm weakness
results = auth_test.test_seed_predictability(
    ecu_id=0x7E0,
    security_level=0x01,
    samples=100
)

if results['predictable']:
    print(f"WARNING: Seed generation is predictable!")
    print(f"Entropy: {results['entropy']}")

# Brute force test
results = auth_test.brute_force_key(
    ecu_id=0x7E0,
    security_level=0x01,
    key_length=4,
    max_attempts=10000
)

Replay Attack Testing

from s800.attacks import ReplayAttack

replay = ReplayAttack(interface='can0')

# Capture authentication sequence
replay.start_capture()
# ... perform legitimate authentication ...
replay.stop_capture()

# Replay captured sequence
success = replay.replay_sequence(delay=0.1)

if success:
    print("WARNING: System vulnerable to replay attacks!")

CAN Bus Flooding

from s800.attacks import BusFlooding

flooder = BusFlooding(interface='can0')

# Test bus resilience
flooder.flood_attack(
    arbitration_id=0x000,  # Highest priority
    duration=10,  # seconds
    utilization=0.95  # 95% bus utilization
)

# Monitor system behavior during attack
# Check if critical messages are affected

Traffic Capture and Logging

Persistent Capture

from s800.capture import ContinuousCapture

# Start background capture
capture = ContinuousCapture(
    interface='can0',
    output_file='/tmp/can_capture.log',
    max_size_mb=1000,
    rotation=True
)

capture.start()

# ... perform testing ...

# Stop and analyze
capture.stop()
statistics = capture.get_statistics()
print(f"Total messages: {statistics['total_messages']}")
print(f"Unique IDs: {statistics['unique_ids']}")

Environment Variables

The framework uses environment variables for sensitive configuration:

export S800_INTERFACE=can0
export S800_LOG_LEVEL=DEBUG
export S800_OUTPUT_DIR=/var/log/s800
export S800_ENABLE_HARDWARE_TESTS=false  # Safety flag

Troubleshooting

CAN Interface Issues

from s800.diagnostics import InterfaceDiagnostics

diag = InterfaceDiagnostics()

# Check interface status
status = diag.check_interface('can0')
if not status['operational']:
    print(f"Interface error: {status['error']}")
    
    # Attempt automatic repair
    if diag.repair_interface('can0'):
        print("Interface repaired successfully")

Permission Errors

# Grant current user CAN access
sudo usermod -a -G dialout $USER
sudo chmod 666 /dev/can*

# Or run with capabilities
sudo setcap cap_net_raw+ep $(which python3)

No ECU Response

# Verify bus activity
from s800.diagnostics import BusMonitor

monitor = BusMonitor('can0')
activity = monitor.check_activity(duration=5)

if not activity['messages_detected']:
    print("No bus activity detected")
    print("Check: cable connections, bitrate, termination resistors")
else:
    print(f"Bus active: {activity['message_rate']} msg/s")

Safety Warnings

IMPORTANT: This framework is for security research and authorized testing only.

• Always test on isolated networks or test benches
• Never test on active vehicles without authorization
• Be aware that improper testing can damage vehicle systems
• Follow responsible disclosure practices for discovered vulnerabilities