Poster: Directed Hybrid Fuzzing on Binary Code

Hybrid fuzzers combine both fuzzing and concolic execution with the wish that the fuzzer will quickly explore input spaces and the concolic execution will solve the complex path conditions. However, existing hybrid fuzzers such as Driller cannot be effectively directed, for instance, towards unsafe system calls or suspicious locations, or towards functions in the call stack of a reported vulnerability that we wish to reproduce. In this poster, we propose DrillerGO, a directed hybrid fuzzing system, to mitigate this problem. It mainly consists of a static analysis and a dynamic analysis module. In the static analysis, it searches suspicious API call strings in the recovered control flow graph (CFG). After targeting some suspicious API call lines, it runs the concolic execution along with path guiding. The path guiding is helped by backward pathfinding, which is a novel technique to find paths backward from the target to the start of main(). Also, we will show that DrillerGo can find the crashes faster than Driller through experimental results.