OS7-6 Obstructing PLC Operations through Modbus Command Manipulation

Title:	OS7-6 Obstructing PLC Operations through Modbus Command Manipulation
Publication:	ICAROB2025
Volume:	30
Pages:	204-207
ISSN:	2188-7829
DOI:	10.5954/ICAROB.2025.OS7-6
Author(s):	Nai-Yu Chen, Cheng-Ying He, Jung-Shain Li, Chu-Sing Yang, I-Hsien Liu
Publication Date:	February 13, 2025
Keywords:	Industrial Control Systems, Programmable Logic Controller, Modbus/TCP, Cybersecurity
Abstract:	Security vulnerabilities in Programmable Logic Controllers (PLCs) within Industrial Control Systems (ICS) using the Modbus/TCP protocol pose significant risks, particularly through stop-and-start command injection attacks that impact PLC operations and cause severe industrial consequences. Supported by Taiwan's National Science and Technology Council (NSTC) and the Water Resources Agency, this research establishes a cybersecurity testbed for water resource systems to investigate these threats. Unauthorized or forged commands are shown to manipulate PLC configurations and ladder logic diagrams, revealing critical weaknesses. Flowchart analyses and Modbus packet examinations highlight the risks and offer actionable insights into effective defense mechanisms for enhancing ICS security.
PDF File:	https://alife-robotics.co.jp/members2025/icarob/data/html/data/OS/OS7/OS7-6.pdf
Copyright:	© The authors. This article is distributed under the terms of the Creative Commons Attribution License 4.0, which permits non-commercial use, distribution and reproduction in any medium, provided the original work is properly cited. See for details: https://creativecommons.org/licenses/by-nc/4.0/

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