Real-time maritime weather conditions including wind speed, wave height, barometric pressure and sea state — updated for the vessel's current position.
📡 Visitor Intel
Visitor intelligence panel — displays connection origin, language, timezone and maritime region context for site visitors.
🛰 Vessel & Fleet Analysis
Live AIS vessel tracking map — displays real-time positions of commercial vessels including cargo ships, tankers and bulk carriers operating in Korean and East Asian waters.
Author: Pascal Ackerman · Published: 2019 · Korean Edition: Acon
Principal Industrial Cybersecurity Consultant @ Rockwell Automation (since 2015) · 15+ years in large-scale industrial systems & network security
Once the boundaries are defined (Chapter 2 — Network Architecture), the question becomes: "How do we protect the assets inside those boundaries?" Even with perfect network segmentation, internal compromise cannot be prevented if the Host itself is vulnerable. Chapter 3 answers precisely this question, addressing security controls at the Host level and mapping them directly to IACS UR E26 and E27 requirements.
Book Flow
Chapter 1
Nature of ICS Operational Characteristics
→
Chapter 2
Network Architecture IDMZ · VLAN · Firewall
→
Chapter 3
Host Security Hardening · Credentials
Attack Scenarios Occurring at the Host Level
Browser ExploitsSAM DumpPrivilege EscalationMisuse of Service Accounts
All of these occur at the Host level. Chapter 3 answers: "How does a Host protect itself once an attacker has penetrated the OT network?"
The essence of Host Hardening is: "Reduce the attack surface." This is one of the most fundamental principles in security theory. In OT environments where EDR and antivirus agents are often restricted, hardening becomes the primary line of defense.
What Constitutes an Attack Surface?
Unnecessary servicesOpen portsDefault accountsExcessive privilegesDefault configuration states
The FileZilla service account example illustrates: "If a service runs with administrator privileges, the entire system becomes exposed to risk."
①
Applying the Principle of Least Privilege
·Services should run under restricted accounts rather than Administrator accounts
·Remove unnecessary local administrator privileges
·Do not use Domain Admin accounts on the Engineering Workstation (EWS)
②
Service Minimization
·Disable SMB if it is not required
·Restrict RDP access
·Remove unnecessary browsers
③
Security Configuration Baseline
→Configuration based on CIS Benchmark
→Use OT-specific hardened system images — aligns with UR E26 Security Configuration Guideline
3.2 Allow-list Based Security — Why Is It Essential in OT?
The key message from the Symantec CSP example: "Only allowed code should be executed." In OT environments, applications are largely fixed and system changes are rare, making allow-listing far more effective than blacklisting.
IT Environment
Users can freely install applications → Blacklist-based security (AV, EDR)
OT Environment
Applications fixed · Changes rare → Allow-list far more effective
Allow-list Technologies
Hash-based execution controlDigital signature verificationKernel-level code integritySecure Boot with TPM
→UR E26 test items: Malicious Code Protection and Use Control for Mobile Code. During testing, verify that unauthorized executables are blocked.
3.3 Patch Management — Why Must OT Approach It Differently?
The WSUS example demonstrates not just a configuration approach but a philosophy. The fundamental dilemma: Applying patches risks system downtime; not applying patches exposes vulnerabilities. OT environments typically adopt risk-based patching.
IT Environments
⚡
Patch ASAP
OT Environments
🔍
Patch After Validation
Typical OT Patch Strategy
→Confirm vendor validation
→Perform pre-testing in a test bench
→Apply patches during a maintenance window
→Prepare a rollback plan
→Maintain N-1 or N-2 version strategies · Firmware updates require stricter control
UR E26/E27 alignment: Security Functionality Verification · Maintenance & Verification Plan · Secure Development Lifecycle
3.4 Credential Protection — Blocking the Critical Phase of an Attack
SAM dump, UAC bypass, and privilege escalation represent critical phases of the attack chain. "The success or failure of an attack often depends on privilege escalation." In OT, administrator privileges on an EWS or HMI can directly translate into the ability to modify PLC logic: Credential compromise = Control over industrial processes.
When an attacker passes the network boundary (Chapter 2) and reaches a Host, the system reduces the attack surface through Hardening, controls execution through Allow-listing, reduces vulnerabilities through Patch Management, and prevents privilege escalation through Credential Protection. This is the fundamental structure of Host Security Fundamentals.
Maritime cybersecurity professional specializing in IACS UR E26/E27 compliance, supplier certification strategy, and Type Approval frameworks. Writing for engineers, consultants, and operators navigating Maritime 4.0.
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