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Zero-click attacks require no user interaction and typically exploit zero-day(i.e., unpatched) vulnerabilities in instant chat applications (such asWhatsApp and iMessage) to gain root access to the victim's smartphone andexfiltrate sensitive data. In this paper, we report our experiences inattempting to secure smartphones against zero-click attacks. We approached theproblem by first enumerating several properties we believed were necessary toprevent zero-click attacks against smartphones. Then, we created a securitydesign that satisfies all the identified properties, and attempted to build itusing off-the-shelf components. Our key idea was to shift the attack surfacefrom the user's smartphone to a sandboxed virtual smartphone ecosystem whereeach chat application runs in isolation. Our performance and usabilityevaluations of the system we built highlighted several shortcomings and thefundamental challenges in securing modern smartphones against zero-clickattacks. In this experience report, we discuss the lessons we learned, andshare insights on the missing components necessary to achieve foolproofsecurity against zero-click attacks for modern mobile devices.

Experience Report on the Challenges and Opportunities in Securing Smartphones Against Zero-Click Attacks