Overview
ISO/IEC TS 27008:2019 - "Information technology - Security techniques - Guidelines for the assessment of information security controls" - provides practical guidance for reviewing and assessing the implementation and operation of information security controls. It focuses on technical assessment of information system controls and evaluating compliance against an organization’s established information security requirements, including controls managed through an ISMS specified by ISO/IEC 27001. The Technical Specification is applicable to organizations of all sizes and sectors that conduct information security reviews and technical compliance checks.
Key Topics
ISO/IEC TS 27008:2019 covers the full lifecycle of control assessment with emphasis on technical methods:
- Assessment process: preparation, planning, scoping, review fieldwork, analysis and reporting, and finalization.
- Resourcing and competence: guidance on skills and resources needed for effective assessments.
- Review methods: process analysis, examination techniques (procedural and technical controls), and testing/validation approaches.
- Testing techniques: blind testing, double blind, grey box, double grey box, tandem testing and reversal - approaches for technical validation.
- Sampling strategies: representative and exhaustive sampling techniques for evidence selection.
- Control assessment process details: scoping, review procedures, object-related considerations, previous findings, external systems and information assets.
- Annexes: practical support including initial information gathering (Annex A), a practice guide for technical security assessments (Annex B), and a technical assessment guide for cloud services - Infrastructure as a Service (Annex C).
Applications
ISO/IEC TS 27008 is designed for practical application across multiple security and compliance activities:
- Internal and external auditors performing control assessments aligned with an ISMS.
- Security engineers and technical assessors conducting vulnerability validation and configuration reviews.
- Compliance officers and risk managers verifying controls meet organizational security requirements.
- Cloud security assessors using the specific guidance for IaaS technical reviews.
- Consulting firms and certification bodies that need structured, repeatable methods for assessing information security controls.
Practical benefits include standardized assessment checklists, structured fieldwork and analysis methods, clear testing approaches (including grey-box and blind testing), and actionable reporting practices that support risk-based decision making.
Related Standards
ISO/IEC TS 27008:2019 is a hands-on resource for organizations and assessors seeking robust, technical guidance for evaluating information security controls and demonstrating control effectiveness, compliance, and improvement opportunities.