CVE-2019-12789

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 v3.0 6.8 MEDIUM
CVSS v2.0 7.2 HIGH

6.8^/10

CVSS v3.0 : MEDIUM

Vector : AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitability : 0.9 / Impact : 5.9

Attack Vector PHYSICAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

7.2^/10

CVSS v2.0 : HIGH

Vector : AV:L/AC:L/Au:N/C:C/I:C/A:C

Exploitability : 3.9 / Impact : 10.0

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
https://www.actiontec.com/blog/	Third Party Advisory
http://seclists.org/fulldisclosure/2019/Jun/10	Exploit Mailing List Third Party Advisory

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Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:actiontec:t2200h_firmware:t2200h-31.1238l.08:*:*:*:*:*:*:*

cpe:2.3:h:actiontec:t2200h:-:*:*:*:*:*:*:*

Information

Published : 2019-06-17 10:15

Updated : 2020-08-24 10:37

NVD link : CVE-2019-12789

Mitre link : CVE-2019-12789

JSON object : View

CWE

NVD-CWE-noinfo

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Products Affected

actiontec

t2200h_firmware
t2200h

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