The United States and Australia have published joint guidance to help critical infrastructure organizations isolate their operational technology systems from potential cyber threats. The document outlines practical steps for separating vital OT and supporting systems from enterprise networks and maintaining operations in an isolated state for extended periods when necessary.
Operational technology systems control physical processes in sectors including energy, water, manufacturing, and transportation. These systems have become increasingly targeted by nation-state actors and cybercriminals, making isolation strategies a key defensive measure. The guidance addresses growing concerns about sophisticated attacks that could disrupt essential services.
The document provides technical recommendations for network segmentation, including how to identify critical OT assets, establish secure boundaries between IT and OT environments, and implement monitoring capabilities. It covers both planned isolation scenarios and emergency disconnection procedures that organizations may need to execute during active cyber incidents.
Critical infrastructure operators face significant risks from cyber attacks that could cause physical damage, service disruptions, or safety hazards. The guidance recognizes that many organizations struggle to balance operational requirements with security needs, particularly when legacy systems lack modern security features. Proper isolation can limit an attacker's ability to move laterally from compromised IT networks into industrial control systems.
Organizations operating critical infrastructure should review the guidance and assess their current OT isolation capabilities. Security teams should work with operational staff to identify systems requiring protection, develop isolation procedures that maintain safety and functionality, and test these procedures regularly. Implementing robust OT isolation strategies can significantly reduce the attack surface and provide crucial time to respond during cyber incidents.
Source: https://www.securityweek.com/us-australia-release-ot-isolation-guidance-for-critical-infrastructure/