CVE-2019-12789 Auth bypass in n/a
Physical access to UART pins allows attackers to bypass authentication and gain root shell access on Actiontec T2200H devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-12789?
CVE-2019-12789 is a medium-severity authentication bypass vulnerability in n/a, published on 17 Jun 2019. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2019-12789?
It affects 1 product.
Products include Actiontec T2200h Firmware.
How do I fix CVE-2019-12789?
No fix has been published for CVE-2019-12789 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2019-12789 being exploited?
There is no known exploitation of CVE-2019-12789 in the wild and no public exploit code.
Sources
Also known as GHSA-c7v4-8hc9-h72r.