Context-Based Whitelisting for Automotive ECU Malware Prevention
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Solution Overview
Problem
Internet-connected devices, such as automotive Electronic Control Units (ECUs), are vulnerable to cyber attacks due to preexisting security bugs, allowing hackers to exploit vulnerabilities and gain control over critical vehicle functions.
Innovation Solution
Implementing context-based whitelisting security policies that restrict operations to authorized processes and contexts, using kernel-level security layers to verify signatures and block unauthorized code execution, thereby preventing malware from infiltrating the internal infrastructure of IoT devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If internet connectivity is added to enable communication and smart features, then device functionality and connectivity are improved, but vulnerability to cyber attacks increases
Solution Approach 1:
The patent implements preliminary security measures by establishing security policies and whitelisting authorized processes before any cyber attack can occur. The system proactively identifies and blocks unauthorized code execution attempts by comparing process signatures against authorized lists, preventing malware from infiltrating the internal infrastructure before it can cause harm.
Solution Approach 2:
The patent introduces a security layer as an intermediary between external internet-connected devices and internal controllers. This intermediary security policy layer intercepts and monitors process execution requests, allowing only authorized processes to pass through while blocking malicious code, thus protecting the internal infrastructure from external cyber threats.
2Reliability
If security policies and whitelisting layers are implemented to prevent malware, then security and reliability are improved, but device complexity increases
Solution Approach 1:
The patent segments the security function into a separate, dedicated security policy layer that operates independently from the main controller functionality. This segmentation allows the security layer to be implemented as a modular component that can be added to existing systems without fundamentally redesigning the entire controller architecture, thus managing complexity while maintaining effectiveness.
Solution Approach 2:
The security layer operates autonomously by automatically comparing process signatures against the whitelisted authorized processes and making decisions about code execution without requiring manual intervention. This self-service mechanism reduces the operational complexity of managing security policies while maintaining robust malware prevention capabilities.
3Object-affected harmful factors
If context-based whitelisting is used to restrict process execution, then security against unauthorized code execution is improved, but operational flexibility decreases
Solution Approach 1:
The patent applies context-based whitelisting with local quality by allowing different process execution permissions based on specific operational contexts. Rather than a blanket restriction, the system evaluates the current context (such as vehicle operating conditions) and selectively permits or blocks processes accordingly, maintaining flexibility where appropriate while preventing unauthorized execution in restricted contexts.
Data Source
AI summary
In one implementation, a method for providing security on an externally connected controller includes launching, by the controller, a security layer that includes a whitelist of permitted processes on the controller, the whitelist including (i) signatures for processes that are authorized to be executed and (ii) context information identifying permitted controller contexts within which the processes are authorized to be executed; determining, by the security layer, whether the particular process is permitted to be run on the controller based on a comparison of the determined signature with a verified signature for the particular process from the whitelist; identifying, by the security layer, a current context for the controller; determining by the security layer, whether the particular process is permitted to be run on the controller based on a comparison of the current context with one or more permitted controller contexts for the particular process from the whitelist.