MCTP Endpoint Authentication for MITM Attack Detection
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Solution Overview
Problem
Current management component transport protocol (MCTP) systems are vulnerable to man-in-the-middle (MITM) attacks, which can disrupt communication between the baseboard management controller (BMC) and PCIe devices, leading to potential data loss and system misbehavior due to denial-of-service or spoofing attacks.
Innovation Solution
Implementing a method where the BMC performs endpoint discovery and authentication, monitors responses to user actions and periodic measurements, and blocks traffic if no response is received or if received measurements do not match expected values, using the SPDM specification to validate endpoint integrity and prevent MITM attacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the MCTP protocol allows any device to become bus owner and assign endpoint-IDs, then the system is flexible and adaptable, but it becomes vulnerable to MITM attacks where rogue devices can disrupt communication
Solution Approach 1:
The BMC performs endpoint authentication before allowing devices to become bus owners or assign endpoint-IDs. This preliminary security check prevents rogue devices from participating in the MCTP network, thereby maintaining both the flexibility of the protocol and the security of communications.
Solution Approach 2:
The BMC acts as an intermediary that mediates between the flexible MCTP protocol and security requirements. It validates endpoint identities and controls bus owner status, preventing MITM attacks while preserving the adaptability of the network protocol.
2Reliability
If the BMC monitors all endpoint communications and measurements, then MITM attacks can be detected, but the system complexity and processing overhead increase
Solution Approach 1:
The BMC monitors specific critical attributes of endpoint communications and measurements rather than all data traffic. By focusing on key security-relevant parameters, the system achieves effective attack detection while minimizing processing overhead and complexity.
Solution Approach 2:
The BMC creates and maintains a trusted configuration database that stores expected endpoint measurements and communication patterns. This copy of the expected state allows for efficient comparison and anomaly detection without requiring complex real-time analysis of all communications.
3Reliability
If the BMC blocks traffic to suspected rogue endpoints, then data loss is prevented, but legitimate communication may be disrupted
Solution Approach 1:
The BMC performs endpoint authentication and establishes a trusted configuration database before normal operations begin. This preliminary setup ensures that legitimate endpoints are identified and authorized, so subsequent traffic blocking only affects confirmed rogue devices, not legitimate communications.
Solution Approach 2:
The BMC continuously monitors endpoint measurements and communications against the trusted configuration database, providing real-time feedback on endpoint legitimacy. This feedback mechanism enables dynamic traffic control that blocks only suspicious communications while maintaining legitimate traffic flow.
Data Source
AI summary
Techniques and mechanisms for verifying integrity of components within a management component transport protocol (MCTP) server system to detect man-in-the-middle (MITM) attacks and preventing data loss upon detection of MITM attacks. For example, a controller may perform an endpoint discovery process and authenticate endpoints within a rack server system. The controller may send requests to endpoints based on user actions and if no response is received from a particular endpoint, the controller may determine there is a MITM attack and block traffic to the particular endpoint. Additionally, the controller may periodically request measurements from endpoints that are related to the code and configuration area of the endpoints. If the received measurements from a particular endpoint do not match expected values, the controller may determine there is a MITM attack and block traffic to the particular endpoint.