ISO/IEC 27017 Compliance

Define the cloud service, deployment and service models, data, workloads, locations, users, administrators, provider chain, and business dependency. ISO/IEC 27017 applies to both cloud service providers and cloud service customers, and one organization can occupy both roles in a supply chain.

Assess the gaps between the customer's security requirements and the provider's fixed or configurable capabilities. Allocate each responsibility to the provider, the customer, or both; document that allocation in the agreement; and confirm that each party can perform its part.

Select the 2015 standard's cloud-specific guidance and additional CLD controls from the service risks and organizational context. Add other controls or customer-side compensating measures when the provider's preset controls do not treat the risk.

Keep a traceability chain from risk to treatment, responsible party, agreement or configuration, operating evidence, exception, and review trigger. Provider certifications and audit reports can support the assessment, but ISO/IEC 27017 states that the customer's legal and contractual compliance responsibilities cannot be transferred to the provider.

The evidence set must match the service, region, provider entity, and period under review. A corporate certificate or generic security page does not show that a particular tenant configuration, log source, backup, or exit process is operating.

Use the agreement and responsibility matrix to identify who must produce each record. Provider evidence can include independent audit reports, service-specific control descriptions, incident procedures, monitoring capabilities, and termination arrangements. Customer evidence can include configuration baselines, access reviews, workload logs, recovery tests, risk acceptance, and change records.

Start before contracting, because preset provider capabilities can leave gaps that require another service, contract terms, or customer controls. Re-run the assessment when the service, provider chain, region, architecture, responsibility boundary, or applicable obligation changes.

The workflow should end with an approved treatment and a usable evidence plan, not a claim that the standard title alone proves compliance. For example, an IaaS provider may protect tenant isolation while the customer hardens guest virtual machines, exports workload logs, selects backups, and tests restoration; the responsibility matrix must record both sides.

Reject claims that omit the service scope, responsible party, evidence period, or exceptions. ISO/IEC 27017 supplies guidance and additional controls; it does not make every control universally applicable or turn a provider's certificate into evidence for every customer-managed configuration.

Keep standards claims separate from legal claims. A law or contract can require particular outcomes or evidence, but that requirement comes from the law or contract, not from ISO/IEC 27017 itself.

Review before selecting the service and whenever a provider, subcontractor, region, workload, architecture, administrator model, agreement, monitoring capability, or legal requirement changes. Incidents, failed recovery tests, control exceptions, and expiring assurance reports are also review triggers.

Update the risk treatment, responsibility matrix, agreement, Statement of Applicability where relevant, and evidence request together. Otherwise downstream teams may rely on a control allocation that no longer matches the service.