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“We find that VC systems are often lacking user authentication mechanisms, or if the mechanisms are present, they are incorrectly implemented (e.g., allowing for PIN bruteforcing),” the researchers wrote in a paper titled Light Commands: Laser-Based Audio Injection Attacks on Voice-Controllable Systems.
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Last, the research highlights the risks that result when VC devices, and the peripherals they connect to, carry out sensitive commands without requiring a password or PIN. A better understanding in the coming years may yield more effective attacks. Additionally, the researchers still don’t fully understand the physics behind their exploit.
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Not only does the research present a novel mode of attack against voice-controllable, or VC, systems, it also shows how to carry out the attacks in semi-realistic environments. Advertisementĭespite those constraints, the findings are important for a host of reasons. What’s more, devices typically respond with voice and visual cues when executing a command, a feature that would alert users within earshot of the device. Except in cases where an attacker uses an infrared laser, the lights are also easy to see by someone who is close by and has line of sight of the device. And for another, the light in many cases must be precisely aimed at a very specific part of the microphone. For one, the attacker must have direct line of sight to the targeted device. The laser-based attacks have several limitations. While the researchers tested only Siri, Alexa, Google Assistant, Facebook Portal, and a small number of tablets and phones, the researchers believe all devices that use MEMS microphones are susceptible to Light Commands attacks. The microscopic MEMS components of these microphones unintentionally respond to light as if it were sound. The attack exploits a vulnerability in microphones that use micro-electro-mechanical systems, or MEMS. Among other things, light-based commands can be sent from one building to another and penetrate glass when a vulnerable device is kept near a closed window. Even when the systems require authentication for certain actions, it may be feasible to brute force the PIN, since many devices don’t limit the number of guesses a user can make. Because voice-controlled systems often don’t require users to authenticate themselves, the attack can frequently be carried out without the need of a password or PIN. Shining a low-powered laser into these voice-activated systems allows attackers to inject commands of their choice from as far away as 360 feet (110m). Dubbed Light Commands, the attack works against Facebook Portal and a variety of phones.
Siri, Alexa, and Google Assistant are vulnerable to attacks that use lasers to inject inaudible-and sometimes invisible-commands into the devices and surreptitiously cause them to unlock doors, visit websites, and locate, unlock, and start vehicles, researchers report in a research paper published on Monday.