Embedded Protocol Security
Fuzzing and security review of CAN bus, Modbus, BACnet, Zigbee, Z-Wave, and BLE protocols used in IoT and industrial embedded systems.
Embedded Protocol Security
Embedded and industrial systems communicate over a diverse range of specialised protocols — from automotive CAN bus and industrial Modbus to IoT wireless standards like Zigbee, Z-Wave, and BLE. These protocols were designed for reliability and determinism, not security. Authentication is often absent, encryption is optional or nonexistent, and the protocol implementations themselves frequently contain exploitable vulnerabilities.
Intelliroot's Embedded Protocol Security service provides expert security assessment of the communication protocols used by your embedded systems, IoT devices, and industrial equipment. We combine protocol-level fuzzing, traffic analysis, and manual security review to identify authentication weaknesses, injection vulnerabilities, replay attack exposure, and implementation flaws.
Protocol Weaknesses Enable System-Wide Attacks
Industrial Protocols Lack Authentication
Modbus, DNP3, BACnet, and other industrial protocols were designed for isolated networks and include no authentication mechanisms. Any device on the network can issue commands to any other device — making network segmentation the only defence, and an often imperfect one.
Wireless Protocols Are Interceptable
Zigbee, Z-Wave, BLE, and LoRaWAN communications can be captured with commodity radio hardware. Weak or absent encryption, hardcoded join keys, and insecure pairing processes allow attackers to intercept, replay, and inject commands into wireless device networks.
Protocol Implementation Bugs Are Exploitable
Even when protocols specify security mechanisms, vendor implementations frequently contain parsing bugs, integer overflows, and state machine vulnerabilities that allow remote code execution or denial of service against protocol stacks.
CAN Bus Has No Security Model
Automotive CAN bus and industrial fieldbus networks have no inherent access control. Any compromised node can broadcast to all others. A single vulnerable ECU or IoT gateway connected to a CAN network provides an attacker with full bus access.
Protocols We Test
Industrial Protocols
Modbus TCP/RTU, DNP3, BACnet/IP, IEC 61850 GOOSE/MMS, EtherNet/IP, PROFINET. Authentication assessment, replay testing, and command injection.
Automotive & Fieldbus
CAN bus, CAN-FD, LIN, FlexRay. Passive monitoring, message injection, ECU spoofing, and DoS assessment. UDS diagnostic service security review.
IoT Wireless
Zigbee, Z-Wave, BLE 4.x/5.x, LoRaWAN, Thread. Key exchange assessment, traffic capture, replay attacks, and device impersonation testing.
Embedded Network Protocols
MQTT, CoAP, AMQP, OPC-UA. TLS configuration, authentication mechanisms, authorisation controls, and protocol-level fuzzing for parsing vulnerabilities.
Our Approach
- 01
Protocol Enumeration
Identify all protocols in use across the target system through documentation review, passive traffic capture, and active protocol discovery.
- 02
Traffic Analysis
Capture and decode protocol traffic. Identify authentication mechanisms (or their absence), encryption quality, and sensitive data exposure in cleartext communications.
- 03
Authentication & Authorisation Testing
Test authentication mechanisms for weaknesses including default credentials, replay vulnerability, and key extraction. Assess authorisation controls for command injection and privilege escalation.
- 04
Protocol Fuzzing
Automated fuzzing of protocol parsers and command handlers using Boofuzz, Sulley, and custom fuzzers. Identify crashes, memory corruption, and denial-of-service conditions.
- 05
Reporting
Protocol-by-protocol findings report with severity ratings, proof-of-concept captures, and remediation recommendations including encryption, authentication, and segmentation guidance.
Deliverables
Protocol Security Report
Per-protocol findings with severity ratings, packet captures demonstrating vulnerabilities, and remediation recommendations.
Protocol Inventory
Complete inventory of all discovered protocols across the assessed environment with security rating for each.
Fuzzing Results & Crash Log
Documented fuzzing campaigns with crash logs, repro cases, and analysis of exploitability for each identified parser vulnerability.
Protocol Hardening Recommendations
Specific guidance for each protocol covering encryption enablement, authentication configuration, network segmentation, and secure implementation patterns.
Request a Security Assessment
Tell us about your environment and security objectives. We'll design a bespoke assessment and deliver a detailed proposal within 48 hours.