Abstraction-based intrusion detection in distributed environments

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Abstract
Ion is an important issue in intrusion detection, since it not only hides the difference between heterogeneous systems, but also allows generic intrusion-detection models. However, abstraction is an error-prone process and is not well supported in current intrusion-detection systems (IDSs). This article presents a hierarchical model to support attack specification and event abstraction in distributed intrusion detection. The model involves three concepts: system view , signature , and view definition . A system view provides an abstract interface of a particular type of information; defined on the instances of system views, a signature specifies certain distributed attacks or events to be monitored; a view definition is then used to derive information from the matches of a signature and presents it through a system view. With the three elements, the model provides a hierarchical framework for maintaining signatures, system views, as well as event abstraction. As a benefit, the model allows generic signatures that can accommodate unknown variants of known attacks. Moreover, abstraction represented by a system view can be updated without changing either its specification or the signatures specified on its basis. This article then presents a decentralized method for autonomous but cooperative component systems to detect distributed attacks specified by signatures. Specifically, a signature is decomposed into finer units, called detection tasks , each of which represents the activity to be monitored on a component system. The component systems (involved in a signature) then perform the detection tasks cooperatively according to the "dependency" relationships among these tasks. An experimental system called CARDS has been implemented to test the feasibility of the proposed approach.

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