CAN Clock Gating Logic Against Message Injection Attacks
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Solution Overview
Problem
Modern vehicle networks, particularly those using the Controller Area Network (CAN) protocol, are vulnerable to attacks where adversaries can inject arbitrary or non-compliant messages, exploiting software interfaces to disrupt communication, which existing defense mechanisms are ineffective against.
Innovation Solution
The implementation of enhanced clock gating and security logic within electronic control units (ECUs) to prevent clock signal manipulation, combined with reset mechanisms and secure state management, ensures that the CAN controller operates within secure parameters, inhibiting malicious message injection and maintaining protocol compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If clock gating is implemented to reduce power consumption, then energy efficiency is improved, but security vulnerability increases due to potential clock signal manipulation
Solution Approach 1:
An intermediary security gating logic is introduced between the processor and clock gating logic. This intermediary monitors the CAN controller status and only permits clock disabling when the controller is in an inactive state, thereby mediating between power management requirements and security concerns.
Solution Approach 2:
The security gating logic performs preliminary validation by checking the CAN controller status before allowing clock gating to take effect. This preliminary action prevents malicious manipulation by ensuring the controller is in a safe state before disabling the clock signal.
2Adaptability or versatility
If software interfaces are exposed for clock control, then operational flexibility is improved, but attack surface increases allowing arbitrary message injection
Solution Approach 1:
The security gating logic acts as an intermediary layer between software interfaces and hardware clock control. It maintains operational flexibility by allowing clock control through software while simultaneously reducing attack surface by validating all clock control requests against CAN controller status.
Solution Approach 2:
The security gating logic applies preliminary anti-action by blocking potentially harmful clock control operations before they can affect the CAN controller. It proactively prevents attacks by checking status and inhibiting clock disabling during active transmission states.
3Use of energy by moving object
If clock signal is disabled during transmission, then power consumption is reduced, but communication reliability deteriorates due to potential attacks
Solution Approach 1:
The security gating logic implements feedback by continuously monitoring CAN controller status and using this information to control clock gating behavior. This feedback mechanism ensures clock is only disabled when safe, maintaining communication reliability while enabling power savings during inactive states.
Solution Approach 2:
The system dynamically adjusts clock gating behavior based on real-time CAN controller status. The clock signal is conditionally enabled or disabled according to whether the controller is actively transmitting, optimizing power consumption without compromising communication reliability.
4Reliability
If existing defense mechanisms are used, then basic security is maintained, but new classes of adversaries can still inject non-compliant messages
Solution Approach 1:
The security gating logic performs preliminary validation by checking CAN controller status before allowing clock control operations. This preliminary action establishes a new defense layer that prevents non-compliant message injection by ensuring clock control only occurs during safe states, protecting against new threat classes.
Data Source
AI summary
An electronic control unit (ECU) includes a processor, a Controller Area Network (CAN) controller, clock gating logic, and security gating logic. The CAN controller having a status and configured to receive data and control signals from the processor, and a clock signal, package the data to create a CAN protocol frame held in at least one transmit buffer, and shift the CAN protocol frame to a CAN transceiver that is configured to transmit the CAN protocol frame to a CAN bus. The clock gating logic may be configured to selectively disable a clock signal to the CAN controller based on a control signal from the processor. The security gating logic configured to, in response to the status of the CAN controller being active, inhibit disabling the clock signal.