IT/OT Convergence in Canada: Managing the New Industrial Attack Surface
For decades, the operational technology that runs Canadian industrial facilities was separated from the corporate IT world. Control systems ran on their own networks, physically isolated, protected as much by disconnection as by any deliberate security control. That separation is disappearing. The drive for remote monitoring, predictive maintenance, cloud analytics, and enterprise data integration has connected OT to IT, and through IT to the internet. This convergence delivers genuine operational value, but it also creates a new and serious attack surface.
This article explains what IT/OT convergence is, why it creates risk, what a real incident looks like, and how Canadian operators manage the exposure without giving up the benefits that drove the connection in the first place.
What IT/OT Convergence Means
IT/OT convergence describes the growing interconnection between information technology, the systems that handle business data, and operational technology, the systems that monitor and control physical processes. In a converged environment, production data flows from the plant floor to enterprise systems and cloud platforms, vendors connect remotely to maintain equipment, and analytics platforms draw on live operational data to optimise performance.
None of this is inherently wrong. The value is real, and operators pursue convergence for sound business reasons. The problem is that OT systems were never designed to be connected. Many run legacy software that cannot be patched, use protocols with no authentication, and assume a level of network isolation that no longer exists. Connecting these systems without deliberate security controls exposes them to threats they were never built to withstand.
Why Convergence Creates Risk
The core risk is straightforward. When OT is connected to IT, and IT is connected to the internet, a path can exist from an external attacker all the way to production systems. An attacker rarely targets the control system directly. Instead, they compromise the corporate network through a phishing email or an exposed service, then move laterally until they find a route into the operational environment. If the boundary between IT and OT is weak or poorly controlled, that route is available.
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The lesson of Colonial Pipeline The 2021 Colonial Pipeline ransomware attack, which disrupted fuel supply across the US East Coast, did not begin in the control system. It began in IT. The operator shut down pipeline operations because it could not be certain the attack had not crossed into OT. Whether or not the malware reached operational systems, an insufficiently segmented connection turned an IT incident into an operational shutdown. That pattern, IT compromise forcing OT consequences, is now the defining industrial cyber risk. |
Why This Matters More in Canada Now
Canadian operators face this risk against a shifting regulatory backdrop. With Bill C-8 and the Critical Cyber Systems Protection Act now law, designated operators of critical infrastructure will be required to protect their critical cyber systems, explicitly including OT, and to demonstrate that protection. Convergence without proper segmentation is precisely the exposure these obligations are designed to address. Managing the converged attack surface is no longer only a matter of good practice; for many operators it is becoming a matter of compliance.
Managing the Converged Attack Surface
The goal is not to reverse convergence, which would sacrifice real operational value, but to enable it safely. That rests on a few principles.
Know what you have
You cannot protect a converged environment you have not mapped. A complete OT asset inventory and a clear picture of the data flows between IT and OT are the foundation. Our walkthrough of the OT risk assessment process describes how operators establish this baseline.
Segment deliberately
Convergence should never mean a flat network. IT and OT should be separated into controlled zones, with the traffic between them limited to what operations genuinely require. The boundary between the corporate network and the operational environment deserves particular attention, because it is the boundary attackers most want to cross.
Use the right control at each boundary
Different boundaries call for different controls. Where two-way communication is genuinely needed, a well-managed firewall is appropriate. Where the data flow is one-way, such as exporting historian or telemetry data out of the control network, a data diode provides the strongest protection by removing the inbound path in hardware. Matching the control to the boundary is what turns segmentation from a diagram into genuine defence.
Control remote access
Remote access is one of the most common ways attackers reach OT in a converged environment. Vendor and staff access to operational systems should run through a controlled, monitored path with multi-factor authentication, never through a direct or unmonitored connection.
Convergence Done Right
Managed well, IT/OT convergence is not a threat to be feared but a capability to be secured. Operators who map their environment, segment deliberately, deploy the right control at each boundary, and control remote access can capture the full value of connected operations while keeping the attack surface under control. The operators who get into trouble are those who connect first and secure later, or never. In a converged world, security has to be part of the connection, not an afterthought to it.
Next Steps
If your OT environment is becoming more connected, the time to secure the convergence is now. Arista Cyber helps Canadian operators map their IT and OT boundaries, design segmentation, and deploy the right controls at each one. Explore our OT cybersecurity services to learn more.
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Securing a converged IT/OT environment? Talk to Arista Cyber about segmentation and high-assurance isolation. |
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