A Framework Based Approach for Formal Modeling and Analysis of Multi-level Attacks in Computer Networks

摘要

Attacks on computer networks are moving away from simple vulnerability exploits. More sophisticated attack types combine and depend on aspects on multiple levels (e.g. protocol and network level). Furthermore attacker actions, regular protocol execution steps, and administrator actions may be interleaved. Analysis based on human reasoning and simulation only has a slim chance to reveal attack possibilities. Formal methods are in principle well-suited in this situation. Since complex scenarios have to be considered, however, high efforts are needed for modeling. Furthermore, automated analysis tools usually fail due to state space explosion. We propose a novel approach for modeling and analyzing such scenarios. It combines the high-level specification language cTLA with a computer network framework, optimization strategies, a translation tool, and the SPIN model checker. As a proof of feasibility we apply our approach to a multi-LAN scenario.