Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Actiontec | T2200H Firmware | t2200h-31.1238l.08 |
| Actiontec | T2200H | - |
References
- http://seclists.org/fulldisclosure/2019/Jun/10ExploitMailing ListThird Party Advisory
- https://www.actiontec.com/blog/Third Party Advisory
- http://seclists.org/fulldisclosure/2019/Jun/10ExploitMailing ListThird Party Advisory
- https://www.actiontec.com/blog/Third Party Advisory
FAQ
What is CVE-2019-12789?
CVE-2019-12789 is a vulnerability with a CVSS score of 6.8 (MEDIUM). 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 sequ...
How severe is CVE-2019-12789?
CVE-2019-12789 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-12789?
Check the references section above for vendor advisories and patch information. Affected products include: Actiontec T2200H Firmware, Actiontec T2200H.