Malware Uses Router LEDs to Steal Data From Secure Networks
Found on Bleeping Computer on Wednesday, 07 June 2017
Specially-designed malware installed on a router or a switch can take control over the device’s LEDs and use them to transmit data in a binary format to a nearby attacker, who can capture it using simple video recording equipment.
For this, an attacker would need to find a security weakness in the device that would allow him to install the malware, either via a remote code execution flaw or a tainted firmware update.
A piece of duct-tape would stop it, but at that point you have an entirely new level of security problems when an untrusted person has access to your routers.