Security Issue of WirelessHART Based SCADA Systems

International audienceThe security of Supervisory Control and Data Acquistition systems (SCADA) has become these last years, a major worldwide concern. Indeed, several incidents and cyber-attacks stressed the emergency to make more efforts to secure these systems which manage important economical infrastructures. The increasing use of wireless sensors also brings their security vulnerabilities. Therefore, several communication protocols were developed to meet real time and security requirements needed by this kind of systems. WirelessHART is the first approved international standard for industrial wireless devices. It implements several mechanisms to ensure hop-by-hop and end-to-end security. However, despite these mechanisms, it remains possible for an attacker to conduct an attack against such wireless networks. In this paper, we give the first description of a Sybil attack specially tailored to target WirelessHART based SCADA systems. This attack can lead to harmful consequences such as disturbing the infrastructure functioning, interrupting it or more again causing its destruction (overheating of a nuclear reactor)

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. As Supervisory Control and Data Acquisition (SCADA) systems control severalcritical infrastructures, they have connected to the internet. Consequently,SCADA systems face different sophisticated types of cyber adversaries. Thispaper suggests a Probability Risk Identification based Intrusion DetectionSystem (PRI-IDS) technique based on analysing network traffic of Modbus TCP/IPfor identifying replay attacks. It is acknowledged that Modbus TCP is usuallyvulnerable due to its unauthenticated and unencrypted nature. Our technique isevaluated using a simulation environment by configuring a testbed, which is acus- tom SCADA network that is cheap, accurate and scalable. The testbed isexploited when testing the IDS by sending individual packets from an attackerlocated on the same LAN as the Modbus master and slave. The experimentalresults demonstrated that the proposed technique can effectively andefficiently recognise replay attacks