摘要：For the purpose of discovering security flaws in software, many dynamic and static taint analyzing techniques have been proposed. By analyzing information flow at runtime, dynamic taint analysis can precisely find security flaws of software. However, on one hand, it suffers from substantial runtime overhead and is incapable of discovering the potential threats. On the other hand, static taint analysis analyzes program’s code without actually executing it which incurs no runtime overhead, and can cover all the code, but it is often not accurate enough. In addition, since the source code of most software is hard to acquire and intruders simply do not attach target program’s source code in practice, software flaw tracking becomes rather complicated. In order to cope with these issues, this paper proposes HYBit, a novel hybrid framework which integrates dynamic and static taint analysis to diagnose the flaws or vulnerabilities for binary programs. In the framework, the source binary is first analyzed by the dynamic taint analyzer. Then, with the runtime information provided by its dynamic counterpart, the static taint analyzer can process the unexecuted part of the target program easily. Furthermore, a taint behavior filtration mechanism is proposed to optimize the performance of the framework. We evaluate our framework from three perspectives: efficiency, coverage, and effectiveness. The results are encouraging.
