ISO/IEC 27017:2015 / ITU-T X.1631 — Information technology — Security techniques — Code of practice for information security controls based on ISO/IEC 27002 for cloud services
This standard provides guidance on the information security aspects of cloud computing, recommending and assisting with the implementation of cloud-specific information security controls supplementing the guidance in ISO/IEC 27002 and other ISO27k standards.
Scope and purpose
The code of practice provides additional information security controls implementation advice beyond that provided in ISO/IEC 27002, in the cloud computing context.
The standard advises both cloud service customers and cloud service providers, with the primary guidance laid out side-by-side in each section. For instance, section 6.1.1 on information security roles and responsibilities says, in addition to section 6.1.1 of ISO/IEC 27002:2013:
Cloud service customer
Cloud service provider
The cloud service customer should agree with the cloud service provider on an appropriate allocation of information security roles and responsibilities, and confirm that it can fulfil its allocated roles and responsibilities. The information security roles and responsibilities of both parties should be stated in an agreement. The cloud service customer should identify and manage its relationship with the customer support and care function of the cloud service provider.
The cloud service provider should agree and document an appropriate allocation of information security roles and responsibilities with its cloud service customers, its cloud service providers, and its suppliers.
Other information for cloud computing
Even when responsibilities are determined within and between the parties, the cloud service customer is accountable for the decision to use the service. That decision should be made according to the roles and responsibilities determined within the cloud service customer’s organization. The cloud service provider is accountable for the information security stated as part of the cloud service agreement. The information security implementation and provisioning ... [read the standard for the full text!]
The standard cites ISO/IEC 27000 and 27002, of course, plus ISO/IEC 17788 (Cloud computing - Overview and vocabulary) and ISO/IEC 17789 (Cloud computing - Reference architecture). Curiously, although ISO/IEC 27001 is noted in the bibliography, it is not considered ‘normative’ i.e. essential reading: it is possible to implement ISO/IEC 27002 with or without an ISMS.
Status of the standard
The standard was developed jointly by ISO/IEC and ITU and hence is dual-numbered as both ISO/IEC 27017 and ITU-T X.1631 with identical content.
The standard was published at the end of 2015.
The standards project had widespread support from ISO/IEC JTC 1/SC 27, ITU-T Q8/SG17, national standards bodies plus the Cloud Security Alliance among others.
As an ambitious first edition of about 40 pages, it may not be brilliant but it is a useful starting point in this rapidly-developing field.
This standard closes a gap in ISO/IEC 27002 section 15 which somehow contrived to cover the information security aspects of supplier relationships without actually mentioning ‘cloud’!
As a sector-specific standard, it falls within the remit of ISO/IEC 27009.
SC 27 decided not to progress a separate cloud information security management system specification standard, judging that ISO/IEC 27001 is sufficient. Therefore, there are no plans to certify the security of cloud service providers specifically. They can however be certified compliant with ISO/IEC 27001, like any other organization.
SC 27’s development of dedicated cloud privacy and cloud service supplier management standards in parallel implies that this standard should have excluded both aspects, referring to those standards instead ... which indeed happened for privacy but not for relationship management. Odd that.
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