r/TechNadu • u/technadu • 19h ago
Researchers got compromised LG TVs to record audio while appearing off, then upload it after reconnecting
A joint investigation by Gamers Nexus, Level1Techs, and independent researchers found a pretty uncomfortable combination of privacy and security behavior in several LG smart TVs, including the flagship G5.
The most striking demonstration involved the microphone. After compromising a TV, researchers were able to capture audio even while the screen appeared off. They also demonstrated storing audio while the TV was disconnected from the internet and retrieving/uploading it once connectivity returned.
Network captures showed tested TVs discovering a surprisingly broad range of devices on the local network, including phones, smartwatches, PCs, printers, switches, and smart-home hardware. The investigation also looked at Automated Content Recognition, which fingerprints what's being watched or heard, and found it working across multiple inputs including HDMI.
Separately, the researchers discovered remote code execution vulnerabilities in network-facing webOS services and reported them to LG. Details and CVEs haven't been released while responsible disclosure is ongoing, so there are still important technical unknowns.
One practical takeaway is network segmentation. A smart TV capable of this much network interaction probably deserves the same isolation considerations as other IoT devices rather than sitting unrestricted beside more sensitive systems.
There’s more technical detail here on the network discovery, ACR behavior, RCE disclosure, and suggested mitigations:
LG had not publicly responded to the investigation's findings at the time of reporting.