Automatically Securing Permission-Based Software by Reducing the Attack Surface: An Application to Android

Alexandre Bartel (1) , Jacques Klein (1) , Martin Monperrus (2) , Yves Le Traon (1)

1 SnT - Interdisciplinary Centre for Security, Reliability and Trust [Luxembourg]
2 ADAM - Adaptive Distributed Applications and Middleware

A common security architecture, called the permission-based security model (used e.g. in Android and Blackberry), entails intrinsic risks. For instance, applications can be granted more permissions than they actually need, what we call a "permission gap". Malware can leverage the unused permissions for achieving their malicious goals, for instance using code injection. In this paper, we present an approach to detecting permission gaps using static analysis. Our prototype implementation in the context of Android shows that the static analysis must take into account a significant amount of platform-specific knowledge. Using our tool on two datasets of Android applications, we found out that a non negligible part of applications suffers from permission gaps, i.e. does not use all the permissions they declare.

Mots clés: permission based model; permission based security model; android; static analysis; attack surface; permission based architecture; permission based software architecture; principle of least privilege

Domaines: Génie logiciel [cs.SE]

Alexandre Bartel, Jacques Klein, Martin Monperrus, Yves Le Traon. Automatically Securing Permission-Based Software by Reducing the Attack Surface: An Application to Android. [Research Report] hal-00700074, SnT. 2012. ⟨hal-00700074v2⟩