In this ultimate how to implement guide to ISO 27001 Annex A 8.9 Configuration Management, you will learn directly from an ISO 27001 Lead Auditor:
- The requirement of the control
- The required implementation steps
- The minimum requirement
I am Stuart Barker, the ISO 27001 Lead Auditor and author of the Ultimate ISO 27001 Toolkit.
Using over 30 years of industry experience across hundreds of audits, I’m giving you the exact templates, walkthroughs, and practical examples you need to achieve ISO 27001 certification.
Table of contents
- ISO 27001 Annex A Configuration Management Implementation Checklist
- 1. Adopt Industry-Standard Security Baselines
- 2. Disable Unnecessary Services and Ports
- 3. Change Vendor Default Passwords immediately
- 4. Create and Maintain “Golden Images”
- 5. Implement Configuration-as-Code (IaC)
- 6. Scrub Hardcoded Secrets from Config Files
- 7. Deploy Automated Drift Detection
- 8. Secure the Boot Process (BIOS/UEFI)
- 9. Review Firewall and ACL Rules Regularly
- 10. Validate with Vulnerability Scanning
- ISO 27001 Annex A 8.9 SaaS / GRC Platform Implementation Failure Checklist
Implementing ISO 27001 Annex A 8.9 is a foundational security discipline that mandates secure configuration management across the entire IT estate. By defining technical baselines and implementing continuous monitoring for configuration drift, organizations ensure system integrity and eliminate vulnerabilities arising from insecure default settings or unauthorized changes.
ISO 27001 Annex A Configuration Management Implementation Checklist
Use this implementation checklist to achieve compliance with ISO 27001 Annex A 8.9. Configuration management is not about writing a policy; it is about establishing technical baselines, hardening systems against CIS benchmarks, and actively monitoring for drift.
1. Adopt Industry-Standard Security Baselines
Control Requirement: Configurations must be established, documented, implemented, monitored, and reviewed.
Required Implementation Step: Do not invent your own security standards. Download the CIS (Center for Internet Security) Benchmarks relevant to your OS (e.g., Windows Server 2022, Ubuntu 22.04) and apply the “Level 1” profile. Document any necessary deviations in a technical exception register.
Minimum Requirement: Evidence of a recognised hardening standard applied to all assets.
2. Disable Unnecessary Services and Ports
Control Requirement: The principle of least functionality must be applied.
Required Implementation Step: Run netstat -an or nmap on your build images. Identify and disable any service not required for the server’s specific role (e.g., Print Spooler on a Web Server, Telnet, FTP). Uninstall the binaries entirely to prevent accidental re-enablement.
Minimum Requirement: If the service is not needed for business, it must be disabled.
3. Change Vendor Default Passwords immediately
Control Requirement: Default authentication credentials must be changed before use.
Required Implementation Step: Audit every new piece of hardware (Firewalls, Switches, IoT, UPS cards). Change the default admin/admin credentials to complex, unique passwords stored in a PAM (Privileged Access Management) vault. Disable the default ‘Administrator’ and ‘Root’ accounts where possible.
Minimum Requirement: Zero devices on the network with factory default credentials.
