Currently available products only provide some support in terms of Intrusion Prevention and Intrusion Detection, but they very much lack Intrusion Diagnosis features. We discuss the limitations of current Intrusion Detection System (IDS) technology, and propose a novel approach - which we call Intrusion Detection & Diagnosis System (ID2S) technology - to overcome such limitations. The basic idea is to collect information at several architectural levels, using multiple security probes, which are deployed as a distributed architecture, to perform sophisticated correlation analysis of intrusion symptoms. This makes it possible to escalate from intrusion symptoms to the adjudged cause of the intrusion, and to assess the damage in individual system components. The process is driven by ontologies. We also present preliminary experimental results, providing evidence that our approach is effective against stealthy and non-vulnerability attacks.
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