Buildings are getting smarter. Sensors, controllers and controllers now hang on networks. Sometimes even to the Internet. Useful for management and energy savings, but the security of building automation deserves extra attention as a result. Below you can read where the risks are and how to address them.
Building automation systems were once isolated installations. The thermostat hung on the wall, the controller was in the technical room, and that was all. Those days are over. Modern systems are connected to enterprise networks, cloud platforms and mobile apps. That connectivity enables remote management. At the same time, it offers attackers an entry point.
In practice, building management systems turn out to be targets of cyber attacks more often than administrators expect. In terms of building automation security, these systems often lag behind ordinary IT environments. So it makes sense for installers and system integrators to include security early in a project.
When your building automation is connected to a corporate network or the Internet, attackers can try to get in. Default passwords that have never been changed, open ports or outdated firmware make this easier. Once inside, an attacker can change settings, disable systems or gain access to other parts of your network.
Many building automation systems run on protocols such as BACnet or Modbus. These were designed for reliability, but building automation security was not a priority at the time. Even software that has not been updated for years often contains known vulnerabilities that attackers can exploit.
A firewall set up incorrectly. Someone clicking on a phishing link. Login credentials circulating through e-mail. These types of human errors pose considerable risk to building automation security.
Place your building automation on a separate network segment, separate from office networks and guest networks. This prevents an attack on one system from spreading to your climate systems. Use firewalls to control traffic between segments.
Replace default passwords immediately upon installation. Use strong, unique passwords for each controller and interface. Where possible, two-factor authentication is recommended. Limit access rights to only those who really need it.
Keep firmware and software up-to-date. Manufacturers regularly release patches that close known vulnerabilities. Monitoring network traffic is also wise. Abnormal behavior, such as unexpected connections or data flows, may indicate an attack.
The right approach depends on your situation. A small office building needs different measures than a hospital or factory. First map out what devices you have, how they are connected and who has access to them. Then you can decide what to prioritize.
For larger installations, a security assessment by a specialist is recommended. This will give you insight into vulnerabilities that you might overlook. With new construction or renovation, it pays to include security for your building automation from the design phase.
Good building automation security starts with reliable components. At Betec Controls we supply sensors, controllers and actuators from manufacturers who take security seriously. Our specialists will gladly advise you on which products fit your security requirements. Feel free to contact or call us on (055) 20 325 30 for advice on your specific situation.
An annual inspection is a good starting point for most buildings. For higher-risk buildings, such as hospitals or data centers, a more frequent check is wise. Also, always check the security of your building automation after major changes to the system or network.
Signs of vulnerability include: default passwords that are still active, firmware that has not been updated for years, or devices that are directly accessible via the Internet without protection. A security scan or assessment identifies weaknesses in your building automation security.
IEC 62443 is the main standard for industrial automation and control systems. Building automation also falls under it. For government buildings in the Netherlands, the Baseline Information Security Government (BIO) applies. Some sectors have additional requirements for building automation security.
