Title: Tinycontrol LAN Controller v3 (LK3) Remote Admin Password Change
Advisory ID: ZSL-2023-5787
Type: Local/Remote
Impact: Security Bypass, Privilege Escalation, System Access
Risk: (5/5)
Release Date: 01.09.2023

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.

Description

The application suffers from an insecure access control allowing an unauthenticated attacker to change accounts passwords and bypass authentication gaining panel control access.

Vendor

Tinycontrol - https://www.tinycontrol.pl

Affected Version

<=1.58a, HW 3.8

Tested On

lwIP

Vendor Status

[18.08.2023] Vulnerability discovered.
[19.08.2023] Vendor contacted.
[31.08.2023] No response from the vendor.
[01.09.2023] Public security advisory released.

PoC

lk3_changepwd.sh

Credits

Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>

References

[1] https://packetstormsecurity.com/files/174457/
[2] https://cxsecurity.com/issue/WLB-2023090013
[3] https://www.exploit-db.com/exploits/51732
[4] https://exchange.xforce.ibmcloud.com/vulnerabilities/275807

Changelog

[01.09.2023] - Initial release
[22.09.2023] - Added reference [1] and [2]
[12.10.2023] - Added reference [3]
[14.02.2024] - Added reference [4]

Contact

Zero Science Lab

Web: https://www.zeroscience.mk
e-mail: lab@zeroscience.mk