Binary diffing analysis quantitatively measures the differences between two given binaries and produces fine-grained basic block level matching. It has been widely used to enable different kinds of critical security analysis. However, all existing program analysis and machine learning based techniques suffer from low accuracy, poor scalability, coarse granularity, or require extensive labeled training data to function. In this paper, we propose an unsupervised program-wide code representation learning technique to solve the problem. We rely on both the code semantic information and the program-wide control flow information to generate basic block embeddings. Furthermore, we propose a khop greedy matching algorithm to find the optimal diffing results using the generated block embeddings. We implement a prototype called DEEPBINDIFF and evaluate its effectiveness and efficiency with a large number of binaries. The results show that our tool outperforms the state-of-the-art binary diffing tools by a large margin for both cross-version and cross-optimization-level diffing. A case study for OpenSSL using real-world vulnerabilities further demonstrates the usefulness of our system.

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