Software analysis to find SIPHON vulnerabilities in Android apps
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Modern applications are often split into separate client and server tiers that communicate via message passing over the network. One well-understood threat to privacy for such applications is the leakage of sensitive user information either in transit or at the server. In response, an array of defensive techniques have been developed to identify or block unintended or malicious information leakage. However, prior work has primarily considered privacy leaks originating at the client directed at the server, while leakage in the reverse direction -- from the server to the client -- is comparatively under-studied. The question of whether and to what degree this leakage constitutes a threat remains an open question. We answer this question in the affirmative with Hush, a technique for semi-automatically identifying Server-based InFormation OvershariNg (SIFON) vulnerabilities in multi-tier applications. In particular, the technique detects SIFON vulnerabilities using a heuristic that overshared sensitive information from server-side APIs will not be displayed by the application's user interface. The technique first performs a scalable static program analysis to screen applications for potential vulnerabilities, and then attempts to confirm these candidates as true vulnerabilities with a partially-automated dynamic analysis. Our evaluation over a large corpus of Android applications demonstrates the effectiveness of the technique by discovering several previously-unknown SIFON vulnerabilities in eight applications.

For more information please refer to our paper.

This repo contains the static analysis (S-Hush) and dynamic analysis (D-Hush) software to identify SIFON vulnerabilities in Android applications.

If you use this code please cite the following paper,

  title={Semi-automated discovery of server-based information oversharing
vulnerabilities in Android applications},
  author={Koch, William and Chaabane, Abdelberi and Egele, Manuel and Robertson,
William and Kirda, Engin},
  booktitle={Proceedings of the 26th ACM SIGSOFT International Symposium on
Software Testing and Analysis},