Security Border Node Anomaly Detection Using SIP Message Context
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Solution Overview
Problem
Current methods for protecting packet-based networks, such as those using SIP signaling, are ineffective in detecting 'zero-day' attacks and sophisticated attacks that rely on message correlation, sequence, or time dependence, as they lack memory and context awareness.
Innovation Solution
Incorporating message context information, such as session history, client behavior, and interarrival times, into anomaly detection systems to identify attacks that were previously undetectable by enhancing the capabilities of existing anomaly detection systems to include state awareness and correlation analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional anomaly detection methods are used on SIP messages, then basic attack detection is achieved, but sophisticated attacks with message correlation and time dependence cannot be detected
Solution Approach 1:
The patent transitions from analyzing individual SIP messages in isolation to analyzing sequences of messages with temporal and contextual dimensions. By incorporating message interarrival times, sequence numbers, and state information, the system adds multiple dimensions to the detection space, enabling identification of correlated attack patterns that span multiple messages.
Solution Approach 2:
The patent introduces a message context provisioning unit as an intermediary component that enriches raw SIP messages with contextual information before anomaly detection. This intermediary layer adds session state, client behavior patterns, and temporal relationships, transforming basic message data into contextualized sequences suitable for detecting sophisticated attacks.
2Measurement precision
If context information is added to enhance detection capability, then detection accuracy improves, but system complexity increases
Solution Approach 1:
The patent divides the security system into distinct functional modules: a message context provisioning unit for context enrichment, an anomaly detection unit for analysis, and a decision unit for response. This segmentation allows each component to specialize in specific tasks, improving detection accuracy while managing complexity through modular design.
Solution Approach 2:
The message context provisioning unit performs preliminary enrichment of SIP messages with contextual information before they reach the anomaly detection unit. By pre-processing messages to include session state, temporal relationships, and behavioral patterns, the system prepares data in advance, reducing the computational burden on the detection unit and improving overall efficiency.
3Reliability
If message context information is collected and analyzed, then correlation-based attacks are detectable, but processing time and resource consumption increase
Solution Approach 1:
The patent maintains continuous session state tracking and message context accumulation throughout the communication session. By continuously updating contextual information in the message context provisioning unit, the system builds a running picture of normal behavior patterns, enabling faster anomaly detection without requiring complete re-analysis of message histories.
Solution Approach 2:
Contextual information such as session state, client behavior baselines, and message interarrival time statistics are pre-computed and maintained during normal operation. When an anomaly needs to be detected, this pre-prepared context is immediately available, reducing the time required for analysis compared to computing these metrics from scratch.
Data Source
AI summary
The invention relates to a security border node (2a) for protecting a packet-based network from attacks, comprising: an anomaly detection unit (10) for performing an anomaly detection, in particular a statistical analysis, on session control messages (11), in particular on SIP messages contained in a packet stream (5) received in the security border node (2a). The security border node further comprises a message context provisioning unit (13) for providing at least one session control message (11) to the anomaly detection unit (10) together with message context information (12, 17, 24) related to a client (22) and/or to a session (23) to which the session control message (11, 11a to 11f) is attributed. The invention also relates to a method for protecting a packet-based network from attacks, to a computer program product, and to a packet-based network.