IT Infrastructure in ISO 27001

This curriculum spans the equivalent of a multi-workshop program used to operationalize ISO 27001 across complex IT environments, covering governance, risk, architecture, and control validation with the same rigor as an internal capability build supported by advisory engagements.

Module 1: Establishing Governance Frameworks Aligned with ISO 27001

• Define scope boundaries for the ISMS by evaluating which business units, systems, and data flows are critical and must be included.
• Select appropriate governance roles (e.g., Information Security Officer, Data Custodians) and formalize their responsibilities in RACI matrices.
• Integrate ISO 27001 requirements with existing enterprise governance structures such as COBIT or NIST CSF.
• Establish a governance committee with executive sponsorship to review risk treatment plans and audit outcomes quarterly.
• Decide whether to adopt a centralized or decentralized governance model based on organizational complexity and regulatory exposure.
• Document decision rights for security controls, especially where IT infrastructure spans multiple departments or geographies.
• Develop escalation paths for unresolved security exceptions, including thresholds for executive reporting.
• Implement a policy exception management process that requires justification, risk assessment, and periodic review.

Module 2: Risk Assessment and Treatment Planning for Infrastructure Assets

• Conduct asset classification exercises to identify critical infrastructure components (e.g., domain controllers, firewalls, backup systems).
• Select risk assessment methodology (e.g., qualitative vs. quantitative) based on data sensitivity and compliance requirements.
• Map infrastructure assets to threat sources (e.g., insider threats, DDoS, supply chain compromise) using threat modeling techniques.
• Assign ownership for each high-risk asset and require owners to participate in risk treatment decisions.
• Choose between risk mitigation, transfer, acceptance, or avoidance based on cost-benefit analysis of control implementation.
• Document residual risks and obtain formal sign-off from business stakeholders before proceeding.
• Integrate risk treatment plans into infrastructure change management workflows to ensure controls are implemented before go-live.
• Define frequency and criteria for re-assessing risks, especially after major infrastructure changes or incidents.

Module 3: Designing Secure Network Architecture per Control 13.1

• Segment network zones (e.g., DMZ, internal, management) based on data classification and access requirements.
• Implement firewall rule sets that follow least privilege and are reviewed quarterly for stale rules.
• Decide between physical and virtual segmentation based on performance, cost, and operational complexity.
• Enforce secure remote access using multi-factor authentication and encrypted tunnels (e.g., IPsec, SSL-VPN).
• Design redundancy and failover mechanisms for critical network components to maintain availability during outages.
• Document network topology diagrams that include security controls and update them after every change.
• Implement network monitoring at segmentation boundaries using IDS/IPS and log correlation.
• Prohibit direct internet access from internal management networks through architectural design.

Module 4: Securing System Administration and Privileged Access

• Define privileged user roles (e.g., Domain Admin, DBA, Cloud Admin) and limit membership to the minimum necessary.
• Implement just-in-time (JIT) access for privileged accounts using a PAM solution with time-bound approvals.
• Enforce multi-factor authentication for all administrative access, including out-of-band methods for emergency access.
• Configure logging for all privileged sessions and ensure logs are sent to a secure, immutable SIEM.
• Establish break-glass accounts with documented procedures for emergency use and immediate post-use review.
• Rotate privileged account credentials automatically using a vaulting solution after each use or at defined intervals.
• Conduct quarterly access reviews for privileged groups and remove inactive or unjustified members.
• Prohibit shared administrative accounts and enforce individual accountability through named logins.

Module 5: Operating System and Endpoint Hardening Strategies

• Develop and maintain secure configuration baselines for all endpoint types (e.g., Windows, macOS, Linux).
• Use configuration management tools (e.g., Ansible, SCCM) to enforce and audit compliance with baselines.
• Disable unnecessary services and ports on servers and workstations to reduce attack surface.
• Implement centralized patch management with defined testing and deployment windows for critical systems.
• Configure endpoint detection and response (EDR) agents to monitor for anomalous behavior and enforce containment policies.
• Enforce disk encryption on all portable devices and manage recovery keys through a secure escrow process.
• Define and deploy host-based firewall rules tailored to system roles (e.g., web server, database).
• Regularly audit configuration drift and generate remediation tickets for non-compliant systems.

Module 6: Cloud Infrastructure Governance and Control Implementation

• Define shared responsibility boundaries with cloud providers and document control ownership for IaaS, PaaS, and SaaS.
• Implement cloud security posture management (CSPM) tools to detect misconfigurations in real time.
• Enforce tagging standards for cloud resources to support cost tracking, compliance, and incident response.
• Configure identity federation between on-premises directories and cloud platforms using SAML or OIDC.
• Design secure landing zones with pre-configured networking, logging, and security controls for new workloads.
• Restrict public access to storage buckets and databases using private endpoints and access policies.
• Implement infrastructure-as-code (IaC) scanning to detect security flaws before deployment.
• Establish logging and monitoring integration between cloud-native services and central SIEM.

Module 7: Availability and Resilience of Critical Infrastructure

• Classify infrastructure components by availability requirements and align with business continuity objectives.
• Design redundant power, network, and compute paths for mission-critical systems to eliminate single points of failure.
• Implement automated failover testing for clustered systems on a quarterly basis.
• Define and test recovery time objectives (RTO) and recovery point objectives (RPO) for key services.
• Store backups in geographically separate locations with access controls and integrity checks.
• Document and maintain runbooks for restoring infrastructure from backup under various failure scenarios.
• Conduct annual disaster recovery drills that involve IT, security, and business stakeholders.
• Monitor infrastructure health using synthetic transactions and alert on performance degradation.

Module 8: Monitoring, Logging, and Incident Response Integration

• Define log retention periods based on legal, regulatory, and forensic requirements (e.g., 180–365 days).
• Standardize log formats and timestamps across infrastructure components to support correlation.
• Deploy centralized logging with write-once storage to prevent log tampering.
• Establish alert thresholds for suspicious activities (e.g., multiple failed logins, privilege escalation).
• Integrate SIEM rules with infrastructure change logs to reduce false positives during maintenance windows.
• Define escalation procedures for security events involving infrastructure components.
• Conduct tabletop exercises to validate detection and response capabilities for infrastructure-based attacks.
• Perform log coverage audits to ensure all critical systems are included in monitoring scope.

Module 9: Change Management and Configuration Control

• Require formal change requests for all infrastructure modifications, including emergency changes.
• Implement a peer-review process for high-risk changes such as firewall rule updates or domain controller changes.
• Use version-controlled repositories to track configuration changes for network devices and servers.
• Enforce maintenance windows for changes to minimize business disruption and simplify impact analysis.
• Perform pre- and post-change validation checks to confirm intended behavior and detect unintended side effects.
• Integrate change management with vulnerability remediation workflows to prioritize critical patches.
• Conduct post-implementation reviews for failed or problematic changes to improve future planning.
• Restrict direct configuration changes outside the change management system through technical enforcement.

Module 10: Internal Audit and Continuous Improvement of Controls

• Develop audit checklists mapped to ISO 27001 Annex A controls relevant to infrastructure.
• Conduct unannounced audits of configuration compliance and access rights for critical systems.
• Validate the effectiveness of implemented controls through technical testing (e.g., penetration testing, vulnerability scans).
• Report audit findings to the governance committee with risk ratings and remediation timelines.
• Track remediation of audit findings in a centralized issue register with ownership and due dates.
• Compare control performance metrics year-over-year to assess maturity improvements.
• Update control objectives and implementation based on audit results, incident trends, and threat intelligence.
• Integrate audit outcomes into management review meetings to support strategic decision-making.