An issue was discovered on Actiontec T2200H T2200H-31.128L.08 devices, as distributed by Telus. By attaching a UART adapter to the UART pins on the system board, an attacker can use a special key sequence (Ctrl-) to obtain a shell with root privileges. After gaining root access, the attacker can mount the filesystem read-write and make permanent modifications to the device including bricking of the device, disabling vendor management of the device, preventing automatic upgrades, and permanently installing malicious code on the device.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| T2200h_firmware | Actiontec | t2200h-31.1238l.08 (including) | t2200h-31.1238l.08 (including) |