A critical infrastructure organization (CIO) manages operational technology (OT) systems that control power distribution grids. These systems are air-gapped from the corporate IT network but still require remote access for maintenance and updates by approved vendors. The cybersecurity architect needs to implement a GRC technical strategy that ensures secure, auditable, and controlled remote access to these highly sensitive OT systems while maintaining their air-gapped isolation. Which strategy is BEST suited for this unique requirement?
- AImplementing a standard VPN solution with multi-factor authentication (MFA) for vendor access.
- BEstablishing a Privileged Access Management (PAM) solution specifically designed for OT environments, often incorporating secure gateways or jump hosts.
- CUtilizing a dedicated, one-way data diode for all data transfers to and from the OT network.
- DDeploying a jump server architecture within a demilitarized zone (DMZ) and strict access controls.
Show answer & explanationAnswer & explanation
Correct answer: B. Establishing a Privileged Access Management (PAM) solution specifically designed for OT environments, often incorporating secure gateways or jump hosts.
A PAM solution tailored for OT environments provides granular control, session recording, and strong authentication for privileged remote access, often leveraging secure gateways or jump hosts to bridge the air gap without directly connecting the OT network to external networks. This ensures auditable, controlled access while maintaining isolation.
Why the other options are wrong
- A. A standard VPN directly connects external users to the network, potentially compromising the air gap and lacking granular control or session recording for OT maintenance.
- C. A data diode allows one-way data transfer, making it useful for data acquisition from OT or patching to OT, but it does not facilitate interactive remote maintenance or bi-directional communication required for updates and troubleshooting.
- D. While jump servers are good, a generic DMZ approach might not inherently provide the OT-specific controls, session monitoring, or granular access management that a dedicated PAM solution offers for critical infrastructure.
OT PAM (Privileged Access Management)
OT PAM extends traditional PAM principles to operational technology environments, providing secure, controlled, and auditable access to critical industrial control systems, often via specialized gateways.
- Secures privileged access to industrial systems.
- Provides granular control and session monitoring.
- Helps maintain network segmentation and isolation.
Memory trick: OT's air gap needs a PAM bridge, not an open door.