PCFuzzing: A penetration combinatorial fuzzing framework by simulating attack trace

In essence, fuzzing is a kind of penetration testing by injecting fault to simulate the attacks. However, current fuzzings do not simulate the attacks in a real sense. They pay more attention to the injection of malformed semi-valid data at a single input point. Nevertheless, an attack is usually a set of cooperative aggressive behaviors at multi input points. In this paper, we present PCFuzzing, a penetration combinatorial fuzzing framework for the software in host environment by simulating attack trace at multi input points. Based on the attack attributes plug-in gained by means of static analysis in advance, PCFuzzing uses dynamic taint tracing to automatically find the input vector that influence values used at key program attack points (points where the program may contain an error), uses symbolic execution and constraint solving to identify the constraint boundary of every input in input vector and constraint relationship of the inputs in input vector, uses combinatorial testing strategies to generate and combine the malformed test case vector, and then injects the combinatorial test case vector to find security vulnerabilities in programs according to the attack strategies in the attack attributes plug-in. Our experimental results indicate that our PCFuzzing can not only effectively expose errors located deep within large applications, but also can avoid the combination explosion to a certain extent because taint tracer in framework uses dynamic taint tracing to reduce the number of inputs involved in the combination and constraint collector in framework uses symbolic execution and constraint solving to narrow the value ranges of input data.