Root Privilege Escalation and Permanent Device Modification Vulnerability in Actiontec T2200H T2200H-31.128L.08

CVE-2019-12789 · HIGH Severity

AV:L/AC:L/AU:N/C:C/I:C/A:C

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.

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