OT Password Policy & RBAC
Regulatory Context: This module details the implementation of IACS UR E27 (Section 4.2). It focuses on the transition from static, shared credentials to a structured Identity and Access Management (IAM) framework suitable for Marine environments.
Onboard a vessel, the greatest vulnerability isn’t always a complex exploit; it is often the “admin/admin” default login on a ballast control HMI or a network switch. Hardening these identities is a mandatory step for E27 Type Approval and Class Surveys.
The Challenge: Balancing Security and Safety
Maritime OT presents a unique conflict: Cyber security demands friction (passwords, MFA), while Marine safety demands immediacy. If a propulsion alarm sounds, an engineer cannot spend 30 seconds typing a complex password just to acknowledge it.
The Legacy Constraints
Marine PLCs often lack central management. This creates “Credential Drift” where different vendors use different passwords, leading the crew to stick post-it notes on screens—negating all security efforts.
The Safety Paradox
Class requirements (UR E27) mandate lockout policies. However, a locked screen on a Dynamic Positioning (DP) console during a storm is a life-safety risk. We solve this by separating “View” from “Control.”
1. Implementing RBAC (Role-Based Access Control)
Access is granted based on the “Principle of Least Privilege.” We categorize users into three tiers:
Tiered RBAC Matrix (Audit Ready)
Defining clear Role-Based Access Control (RBAC) boundaries is essential for preventing unauthorized configuration changes while ensuring operational safety. This matrix provides an audit-ready framework for mapping vessel duties to technical permissions, ensuring that critical safety functions remain accessible to watch officers while high-risk logic modifications are restricted to authorized technical staff and OEMs.
2. Tiered Complexity Standards
We apply a tiered approach based on the device’s position within the Purdue Model.
Password Change & Rotation Log
To maintain IACS UR E27 compliance, all maritime OT assets must undergo periodic credential rotation. This log provides a centralized audit trail to verify that infrastructure, such as firewalls and gateways, are updated according to the quarterly schedule mandated in the Asset Complexity tiers.
3. Managing Credentials in Air-Gapped Environments
Because vessels operate in zero-connectivity environments, a Vessel Credential Management Plan is required:
- Onboard Offline Vault: Utilize an encrypted database (e.g., KeePassXC) stored on a secured workstation in the ETO office.
- Physical MFA: Use hardware tokens (Yubikeys) for access to the Satellite Terminal and Primary Firewall to prevent credential theft.
Compliance Documentation Previews
Standardized templates for managing remote access and RBAC. View watermarked previews below; premium SOPs and fillable forms require the Pro Bundle.
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MFA Implementation for Maritime OT
MFA Implementation for Maritime OT Regulatory Context: IACS UR E26 (Section 4.2.3) mandates Multi-Factor Authentication ...
