The laser demonstration closes that gap entirely: by modulating light onto a microphone's diaphragm at a tuned frequency, researchers can speak to Siri, Alexa, or Google Assistant from across a room or farther — no speaker, no proximity, no sound at all. That turns every assistant with line of sight into a remote actuator for whatever it controls.
First-order effects
Owners of internet-connected locks, garages, and cars that respond to voice commands inherit a new threat model: an adversary outside the building who never needs to be heard or seen.
Amazon, Google, and Apple face pressure to add speaker verification or liveness checks to assistants that today execute any well-formed command they receive.
Second-order effects
Smart-home and automotive makers whose devices sit behind an assistant now share responsibility for a vulnerability in someone else's microphone, pushing authentication decisions upstream into the assistant layer.
The finding compounds earlier physical-access research like the Cortana lock-screen bypass, giving enterprise buyers concrete grounds to demand voice-assistant hardening before deploying speakers in offices and lobbies.
Third-order effects
As assistants gain authority over physical actuators, the industry's trust boundary has to shift from 'who is holding the device' to 'what signal is authentic,' making sensor-level spoofing a recurring class rather than a one-off bug.
If covert-command demonstrations keep escalating across modalities, regulators and insurers treating smart-home devices as consumer gadgets may start requiring authenticated command channels as a condition of sale or coverage.
The trend: Each generation of covert-command research — ultrasonic, hidden-in-audio, and now optical — strips away another precondition of attack just as voice assistants take on more physical-world control, making assistant authentication a structural security requirement rather than a feature.
Researchers found that varying the intensity of a laser pointed at a smart speaker's mic could trick it into behaving as if it were receiving voice commands—silently telling Alexa to make purchases or unlock doors via a window from hundreds of feet away. https://www.wired.com/...
Today in cool (& scary) tech news: Hackers can take over Alexa, Google Home, & Siri using a laser pointer, even from outside a house @DrKevinFu & colleagues uncovered this attack, and showed how it can open someone's garage doors and household locks https://www.nytimes.com/...
This is just awesome! It's one of those papers you see maybe once a year which make you think “Gosh, I wish I'd done that.” The research web page is here: https://lightcommands.com/ https://twitter.com/...
'"It's possible to make microphones respond to light as if it were sound," says Suguwara. “This means that anything that acts on sound commands will act on light commands."' https://www.wired.com/...
Takeshi Sugarawa and frmr CCC Council Member @DrKevinFu discuss how hackers can use lasers to ‘speak’ to your voice assistants in a recent @WIRED article https://www.wired.com/...
Dunno why coverage I've read of the laserpointers being used to control smart assistants doesn't include this but: - this is typically hard to do (important for threat model) - but here are some prices of equipment, pretty low https://lightcommands.com/... pic.twitter.com/U3olxo…
In the latest frightening “discovery” in voice-command tech,researchers have discovered microphones respond to certain light as if it were sound. Ie- from outside your window, hackers with a laser pen can have #Alexa open doors, order things online, etc.🙈 https://www.wired.com/..…
“the microphones in the devices will respond to light as if it was sound...That movement can be replicated by focusing a laser or a flashlight at the diaphragm, which converts it into electric signals...The rest of the system then responds the way it would to sound.” https://twit…
Holy shit. Hackers can use lasers—from 164 feet away—to manipulate your Amazon Echo or Google Home to, say, open a garage door. https://www.wired.com/...
NEW: We've long worried voice assistants like Alexa and Google Home could be easily hacked. We just never knew all it entailed was a flashlight. https://www.nytimes.com/...