Post Syndicated from Kevin Donohue original https://aws.amazon.com/blogs/security/fast-track-ism-ready-cloud-environments-and-irap-assessments-with-landing-zone-accelerator-on-aws/

This post announces the availability of a new independent assessment report available on AWS Artifact analyzing how Landing Zone Accelerator on AWS (LZA) can automatically deploy multi-account environments in Amazon Web Services (AWS) with Australian Government Information Security Manual (ISM) security controls coverage at scale. The report includes findings from an independent third-party analysis conducted by AWS Partner gwi.digital. In addition to the report, we talk about ISM compliance applicability to LZA and a new testing mechanism for measuring configuration drift, which together can provide Australian customers with a documented and validated foundation to accelerate IRAP assessment readiness.

Australian organizations in public sector, defense, and critical infrastructure agencies must build cloud environments that meet (ISM requirements. The ISM defines 1,081 security control requirements across 22 guideline chapters. Demonstrating compliance is central to achieving an IRAP assessment outcome, but assessments typically require months of preparation, evidence gathering, and testing.

In October 2025, we introduced the LZA Universal Configuration and LZA Compliance Workbook. LZA provisions a multi-account security architecture that automates the deployment of nearly 200 security controls based on AWS Well-Architected pillars and AWS security best practices. The LZA Compliance Workbook, available on AWS Artifact, documents how the Universal Configuration (UC) maps to technical security requirements from 17 global compliance frameworks, with more being added. LZA is an ideal solution for customers with security and compliance obligations—both existing and anticipated—because the guardrails it deploys are applied automatically to new accounts as environments grow.

To see how LZA can help customers in Australia we teamed up with AWS Partner gwi.digital to run LZA as a customer would. gwi.digital is a consultancy partner specializing in cybersecurity and governance, risk, and compliance (GRC) and has deep experience in IRAP assessments and the ISM framework. The team conducted an independent analysis and evaluation of LZA UC against 1,081 ISM controls. The assessment was conducted in a greenfield AWS environment hosted in the ap-southeast-2 (Sydney) AWS Region, positioned within Phase 2 of the ASD Cloud Security Assessment and Authorization Framework and focused on cloud consumers building on already-authorized AWS services. It builds on existing AWS IRAP foundations: Underlying AWS services were most recently independently assessed at the PROTECTED level by CyberCX last year. While this report does not constitute an official IRAP authorization, certification, or accreditation, it provides a professional evaluation of evidence based on what LZA delivers out of the box (and what it does not), so organizations can make informed decisions.

Of the 1,081 ISM controls, 256 are within the addressable scope of LZA and include the technical infrastructure controls that a solution like LZA can meaningfully address. Of those 256, LZA achieves Full or Partial coverage for 234 (91%). The remaining 825 controls are outside the scope of LZA: physical security, personnel, organizational governance, and classification-level exclusions. A key contribution for the assessment was analysis of the shared responsibility model that goes beyond the traditional AWS/customer binary. It considers a three-tier view—AWS (provided), LZA (enabled), and Customer (responsibility)—and further categorizes the 825 out-of-scope controls into subcategories so customers can quickly determine which controls require their attention compared to which are already addressed at the infrastructure level. By combining automated deployment, ISM-specific compliance mappings, independent validation, and continuous evidence generation, Australian customers can reduce IRAP assessment timelines while achieving more reliable compliance outcomes.

Note: Results are based on the configuration as-provisioned based on the LZA version and during the time of this assessment. Results may vary depending on customer implementation and configuration choices.

Confirming controls are implemented and operating effectively across your environment is complex and often lacks complete coverage. To simplify testing your LZA deployment, we developed the Controls Acceptance Testing Suite (CATS). CATS is an automated compliance validation engine that runs purpose-built tests against the security configuration baseline deployed by LZA UC. For the ISM assessment, CATS executed over 3,600 individual tests across six AWS accounts, evaluating account structure, identity and access, network configuration, logging, encryption, and backup. For Australian customers, CATS enables:

• Automated evidence generation: Machine-readable results may replace weeks of manual evidence collection
• ISM-enriched reporting: gwi-digital developed a conversion script that maps CATS output to ISM control references, enabling auditors to interpret results from an ISM perspective
• OSCAL export: Results in Open Security Controls Assessment Language (OSCAL) format for interoperability with assessment tools
• Continuous drift detection: Repeatable execution identifies when configurations deviate from the validated baseline between assessment cycles

Note: CATS availability is limited and currently accessible only through AWS Professional Services as a private beta solution and may be subject to change. Availability, features, and pricing are subject to change without notice. Contact your AWS account representative or reach out to a member of the LZA team for questions about CATS, or to provide feedback on the LZA ISM report.

Through the assessment, gwi-digital identified configuration adjustments that elevate specific control ratings from Partial to Full, with minimal effort; for example, increasing the default password length from 14 to 15 characters or adjusting log retention to align with Australian Federal Disposal Authority standards. These recommendations have been communicated to the LZA UC team for inclusion in a future ISM-specific guidance section in LZA GitHub documentation.

In addition to the LZA ISM report, you can also find the LZA Compliance Workbook available on AWS Artifact. It maps related ISM requirement identifiers to security implementation statements, giving you a starting point from which you can customize and enhance your compliance documentation for your unique use cases after deploying LZA.

1. Sign in to your AWS account and then download the LZA Australia ISM Third-Party Analysis and Evaluation Report and LZA Compliance Workbook from AWS Artifact.
   
   

   Figure 1: LZA report and workbook in AWS Artifact

2. Visit the LZA Universal Configuration GitHub repository to review and download the latest configuration baseline.
3. Use the LZA Implementation Guide to see use cases, review pre-deployment considerations and then follow deployment steps.
4. Set-up a security compliance chat agent. Consider creating a knowledge base with Amazon Bedrock using the LZA Compliance Workbook, LZA Implementation Guide, web crawlers to the LZA GitHub, and your custom resources to set up your own chat agent.

If you have questions, contact a gwi.digitalexpert, AWS LZA team member, or your AWS account representative.

The combination of ISM mappings in the LZA Compliance Workbook, the gwi-digital analysis report, and CATS evidence gives Australian customers a head start on IRAP assessments.

• Weeks saved on scoping: Pre-determined control applicability significantly reduces upfront scoping effort
• Documentation ready: Implementation statements and control requirement alignment reduce the documentation burden
• Independent assurance: A third-party report that customers and their assessors can reference directly
• Continuous evidence: CATS generates repeatable security evidence between assessment cycles, replacing periodic manual audits with ongoing assurance

The Landing Zone Accelerator team would like to thank Baden Hughes, Henrik Melkonyan, Iain Lindsay-German, and Ian Roderick from gwi.digital for their professionalism and expertise in performing an incredibly thorough assessment, helping us to make LZA better for customers, and for their contributions to this blog post.

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