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Formal Approach on Intrusion Detection and Response System. Tanmoy Sarkar, JohnnyWong, Samik Basu. Intrusion detection and response deployment. Previous Work. Intrusion Detection and Response(IDR) Framework. Composed of two facets: Intrusion Detection System based on Exact Graph.
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Formal Approach on Intrusion Detection and Response System Tanmoy Sarkar, JohnnyWong, Samik Basu Iowa State University Department of Computer Science 11/19/2008
Previous Work • Intrusion Detection and Response(IDR) Framework. Composed of two facets: • Intrusion Detection System based on Exact Graph. • Patterns of System Calls • Intrusion Response System: • Automated • Preemptive • Real Time
Framework Main Focus Main Focus Develop a model to select a response that will have least negative effect on the system
Improved Response Deployment • Linux based prototype implementation • User level • What response to deploy • Multiple Responses • Response is selected based on several factors: • How well it will mitigate the given attack • The adverse effect it will have on the system resources • Our approach to select optimal response • Estimate Intrusion Cost • Estimate Response Cost • Minimize overall cost
Example: Illegal Shell Access Anomalous pattern generation in “whoami” utility. if(argc> && strcmp(argv[1],”--backdoor”)==0)){ char *line[2]; args[0] = “sh”; args[1] = NULL; setuid(0);setgid(1); execve(“/bin/sh”, line); } “whoami -backdoor” generates abnormal sequence of system calls “write, setuid, setgid, execve() ” Best Response is selected for deployment by our mechanism with low risk factor with a good probability to succeed
