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VM-FIT: Supporting Intrusion Tolerance with Virtualisation Technology

The use of virtualisation technology on modern standard PC hardware has become popular in the recent years. This paper presents the VM-FIT architecture, which uses virtualisation for realising fault and intrusion tolerant networkbased services. The VM-FIT infrastructure intercepts the client–service interaction at the hypervisor level, below the guest operating system that hosts a service implementation, and distributes requests to a replica group. The hypervisor is fully isolated from the guest operating system and provides a trusted component, which is not affected by malicious intrusions into guest operating system, middleware, or service. Furthermore, the hypervisor allows the implementation of more efficient strategies for proactive recovery in order to cope with the undetectability of malicious intrusions.