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CISA/NCSC-UK/FBI — Secure connectivity principles for OT networks

• Category: Security

  • What happened: CISA, NCSC-UK, FBI and international partners released a joint guide on secure connectivity for operational technology (OT).
  • Core driver: OT networks increasingly connect to enterprise IT for remote monitoring, analytics, and predictive maintenance — and that convenience expands the attack surface.
  • Framing (good): the guidance emphasizes building secure connectivity into the network design, not bolting it on after incident response.
  • Impact context: in OT, compromise can translate into physical harm, environmental damage, and service disruption, not just data loss.
  • Threat model: the writeup explicitly references both highly capable adversaries (incl. nation-state) and opportunistic actors.
  • Practical takeaway: treat “secure connectivity” as an engineered property: authenticated pathways, well-defined trust boundaries, and continuous monitoring.

Why it matters

  • OT/IT convergence is irreversible: if your org is adding AI-assisted monitoring or automation on top of OT data, the connectivity layer becomes the choke point attackers will target.
  • Safety depends on cyber: “cybersecurity as a safety control” is finally becoming mainstream language in OT — which helps justify budget and design changes.
  • Guidance is a forcing function: joint publications like this tend to show up in audits, insurance questionnaires, and procurement requirements.

What to do

  1. Map connections: document every OT ↔ IT connection, including vendor remote access, monitoring agents, and jump hosts.
  2. Reduce implicit trust: segment aggressively; prefer one-way or brokered flows where possible (data diode patterns, dedicated proxies).
  3. Harden remote access: MFA, device posture checks, short-lived credentials, and strict allowlists for where admin tooling can reach.
  4. Monitor the right signals: log authentication events, remote sessions, and unusual command sequences; build alerts for new paths and new destinations.
  5. Practice response: run tabletop exercises that assume connectivity is abused (not just malware on a workstation) and validate “break glass” procedures.

Sources