AccessiLeaks: Investigating Privacy Leaks Exposed by the Android Accessibility Service

Nov 20, 2018

New paper accepted at the Privacy Enhancing Technologies Symposium (PETS)!

Our paper entitled “Investigating Privacy Leaks Exposed by the Android Accessibility Service” coauthored with Andreas Zeller from University of Saarland has been accepted for publication to the upcoming edition of the international symposium on Privacy Enhancing Technologies (PET).

Abstract: To support users with disabilities, Android provides the accessibility services, which implement means of navigating through an app. According to the Android developer’s guide: “Accessibility services should only be used to assist users with disabilities in using Android devices and apps”. However, developers are free to use this service without any restrictions, giving them critical privileges such as monitoring user input or screen content to capture sensitive information. In this paper, we show that simply enabling the accessibility service leaves 72% of the top finance and 80% of the top social media apps vulnerable to eavesdropping attacks, leaking sensitive information such as logins and passwords. A combination of several tools and recommendations could mitigate the privacy risks: We introduce an analysis technique that detects most of these issues automatically, e.g. in an app store. We also found that these issues can be automatically fixed in almost all cases; our fixes have been accepted by 70% of the surveyed developers. Finally, we designed a notification mechanism which would warn users against possible misuses of the accessibility services; 50% of users would follow these notifications.

Citation: Mohammad Naseri, Nataniel P. Borges Jr., Andreas Zeller, Romain Rouvoy. AccessiLeaks: Investigating Privacy Leaks Exposed by the Android Accessibility Service. The annual Privacy Enhancing Technologies Symposium (PETS), Jul 2019, Stockholm, Sweden.

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