USB Power Delivery Side-Channel Security for Malicious Packet Blocking
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Solution Overview
Problem
The USB power delivery side channel, used for negotiating power delivery modes between devices, introduces vulnerabilities to cyber-attacks, allowing malicious code to exploit the power delivery protocol for attacks such as virus infection, unauthorized power delivery modes, and data leakage.
Innovation Solution
Implementing a security agent within devices or CPD protocols that monitor, analyze, and secure the power delivery side channel by filtering packets, enforcing unidirectional data flow, logging events, and enabling secure firmware updates, among other security measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power delivery side channel is introduced to negotiate power delivery modes between devices, then power delivery functionality and device communication capability are improved, but vulnerability to cyber-attacks increases
Solution Approach 1:
A security agent is introduced as an intermediary component between the power delivery protocol processing and the physical power delivery channel. This agent monitors, filters, and validates all communications on the power delivery side channel, blocking malicious packets while allowing legitimate power negotiation to proceed. The agent acts as a mediator that separates the useful power delivery function from the harmful cyber-attack vectors.
Solution Approach 2:
The security agent performs preliminary validation and filtering of power delivery protocol packets before they are processed by the device. By pre-screening incoming packets for malicious content and pre-authorizing legitimate communication patterns, the system prevents attacks before they can execute, rather than responding after detection.
2Reliability
If security measures are implemented to protect against cyber-attacks on power delivery protocol, then security against malicious activities is improved, but device complexity increases
Solution Approach 1:
The security agent is designed to handle multiple security functions within a single integrated component: packet filtering, protocol validation, malicious activity detection, and secure communication management. By consolidating these diverse security tasks into one multi-functional agent, the patent reduces overall system complexity compared to implementing separate dedicated components for each security function.
3Reliability
If monitoring and filtering of power delivery protocol traffic is performed, then detection of malicious activity is improved, but processing time and energy consumption increase
Solution Approach 1:
The security agent implements partial filtering by focusing monitoring efforts on specific packet types and communication patterns that are most likely to contain malicious content. Rather than analyzing every single packet in depth, the agent applies targeted filtering rules to high-risk traffic while allowing low-risk traffic to pass with minimal processing, thereby reducing overall energy consumption while maintaining effective detection capability.
Data Source
AI summary
A method, security agents, devices and medium for securing devices using combined power data (CPD) protocols that support power delivery side channels. The method/devices/medium comprise one or more security agents that perform at least one of or any combination of: monitoring the signaling and power on the power delivery pins; analyzing the power delivery protocol traffic to detect cyber-security events; detecting malicious activity on the power delivery protocol; filtering or blocking specific type of packets or messages with specific data payload; enforcing unidirectional data flow on the power delivery protocol; logging, auditing and archiving events on the power delivery protocol; locking or disconnecting suspicious devices; preventing activation of some power delivery modes; disabling firmware updates through power delivery protocol; enabling firmware updates through power delivery protocol only in the presence or with a confirmation of a setup device; and allowing passage of only specific type of packets or messages with specific data payloads.