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Modern smart TVs often communicate with their remote controls (includingthose smart phone simulated ones) using multiple wireless channels (e.g.,Infrared, Bluetooth, and Wi-Fi). However, this multi-channel remote controlcommunication introduces a new attack surface. An inherent security flaw isthat remote controls of most smart TVs are designed to work in a benignenvironment rather than an adversarial one, and thus wireless communicationsbetween a smart TV and its remote controls are not strongly protected.Attackers could leverage such flaw to abuse the remote control communicationand compromise smart TV systems. In this paper, we propose EvilScreen, a novelattack that exploits ill-protected remote control communications to accessprotected resources of a smart TV or even control the screen. EvilScreenexploits a multi-channel remote control mimicry vulnerability present in todaysmart TVs. Unlike other attacks, which compromise the TV system by exploitingcode vulnerabilities or malicious third-party apps, EvilScreen directly reusescommands of different remote controls, combines them together to circumventdeployed authentication and isolation policies, and finally accesses orcontrols TV resources remotely. We evaluated eight mainstream smart TVs andfound that they are all vulnerable to EvilScreen attacks, including a Samsungproduct adopting the ISO/IEC security specification.

EvilScreen Attack: Smart TV Hijacking via Multi-channel Remote Control Mimicry