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Model checking is a verification method developed to§test finite-state systems (e.g., communication§protocols, hardware circuits) against properties§expressed as formulas in temporal logic. The method§has proved successful in finding design flaws in many§real-life applications. Nevertheless,§models especially of software systems often tend to §have unbounded number of states. Traditionally,§verifying such systems using model checkers requires§first abstracting the systems into finite-state§models. We introduce a unified, automata-based§representation for infinite-state systems and linear§temporal logic properties, and describe a§model-checking technique for such specifications. We§exploit constraint solving and logic programming to§implement an efficient and robust infrastructure for§our model checker, and apply this implementation to§analyze vulnerabilities of computer systems and§configurations.