ISO 27001 Annex A 5.23 Information Security For Use Of Cloud Services

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ISO 27001 Information Security For Use Of Cloud Services

In this ultimate guide to ISO 27001 Annex A 5.23 Information Security For Use Of Cloud Services you will learn

  • What is ISO 27001 Annex A 5.23
  • How to implement ISO 27001 Annex A 5.23

I am Stuart Barker, the ISO 27001 Ninja and author of the Ultimate ISO 27001 Toolkit.

With over 30 years industry experience I will show you what’s new, give you ISO 27001 templates, show you examples, do a walkthrough and show you how to implement it for ISO 27001 certification.

What Is ISO 27001 Annex A 5.23 Information Security For Use Of Cloud Services?

ISO 27001 Annex A 5.23 Information security for use of cloud services is an ISO 27001 control that requires an organisation to specify and manage information security for the use of cloud services.

ISO 27001 Annex A 5.23 Purpose

The purpose of ISO 27001 Annex A 5.23 is a preventive control that ensures you specify and manage information security for the use of cloud services.

ISO 27001 Annex A 5.23 Definition

The ISO 27001 standard defines ISO 27001 Annex A 5.23 as:

Processes for acquisition, use, management and exit from cloud services should be established in accordance with the organisation’s information security requirements.

ISO27001:2022 Annex A 5.23 Information security for use of cloud services

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ISO 27001 Annex A 5.23 Implementation Guide

Cloud services can be treated to all intents and purposes like any supplier. The standard calls them out, because, in some ways it feels like they felt they had to. It gives a list of requirements that are unrealistic and then acknowledges it is unlikely you can meet them.

Before we look at what you can do let us paraphrase what the standard thinks as the get out.

It absolutely acknowledges that yes, cloud service agreements are pre defined and not open to negotiation on the whole. So why give a list of requirements? Who knows. This is about basic good practice of supplier management. They could have said that. But they did not.

You will ensure

ISO 27001 Annex A 5.21 Managing Information Security In The ICT Supply Chain

ISO 27001 Annex A 5.22 Monitor, Review And Change Management Of Supplier Services

Follow good third party supplier management as previously covered including risk management and if at any point you are worried seek additional guidance from the standard which will guide you and then say, but we appreciate this cannot be done.

Cloud Service Agreements

I am not even going to cover what the standard thinks should be in cloud service agreements as already stated, the standard acknowledges that these are non negotiable. If you are interested, refer to your copy of the ISO 27002 standard.

How to write a Cloud Security Policy

A step-by-step tutorial on how to create a cloud security policy for ISO 27001 in under 10 minutes. I walk you through the process of creating a policy, including what to include in the policy and how to comply with the ISO 27001 standard.

For a deeper understanding of the ISO 27001 Cloud Security Policy see the ultimate guide: Cloud Security Policy: Ultimate Guide (+ template)

ISO 27001 Cloud Security Policy

ISO 27001 Templates

The standard requires a topic specific ISO 27001 Cloud Security Policy and you will need the ISO 27001 Third Party Supplier Register to record and manage your cloud suppliers.

How to comply

To comply with ISO 27001 Annex A 5.23 you are going to implement the ‘how’ to the ‘what’ the control is expecting. In short measure you are going to include Cloud Services in supplier management and:

  • Implement a topic specific policy
  • Implement a supplier management process
  • Include in your supplier management process supplier acquisition and supplier transfer
  • Implement a third party supplier register
  • Have agreements with all suppliers that cover information security requirements
  • Have information security assurances for critical suppliers as a minimum and ideally all relevant suppliers
  • Monitor those suppliers
  • Respond to adverse incidents in a structured way

How to pass an audit

To pass an audit of ISO 27001 Annex A 5.23 Information security for use of cloud services you are going to make sure that you have supplier management that also covers cloud services and that you have followed the steps above in how to comply.

You are going to do that by first conducting an internal audit, following the How to Conduct an ISO 27001 Internal Audit Guide.

What will an audit check?

The audit is going to check a number of areas. Lets go through the most common

1. That you have a cloud supplier agreements in place

The auditor is going to check that you have agreements in place with cloud suppliers that cover the information security requirements. It will check that those agreements are in date and cover the products and / or services acquired.

2. That you have an ISO 27001 Supplier Register

You will need an ISO 27001 Supplier Register to record and manage your suppliers. Make sure it is up to date and reflects your reality.

3. Documentation

They are going to look at audit trails and all your documentation and see that is classified and labelled. All the documents that you show them, as a minimum if they are confidential should be labelled as such. Is the document up to date. Has it been reviewed in the last 12 months. Does the version control match.

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Top 3 Mistakes People Make

The top 3 Mistakes People Make For ISO 27001 Annex A 5.23 are

1. You have do not monitor cloud suppliers

Make sure that there are reviews and monitors in place. Perhaps meetings. Perhaps reports. Perhaps dashboards. Be sure to be able to evidence that you review and monitor those suppliers. You will have processes for adverse advents so do not be surprised if you are asked to evidence an adverse event, problem or issue and that you followed your process.

2. You have no assurance they are doing the right thing for information security

Make sure you have done your security assessment and can place your hands on an in date certificate such as an ISO 27001 Certification for assurance they are doing the right thing. It needs to be in date a cover the products and / or services you have acquired and are using form the supplier.

3. Your document and version control is wrong

Keeping your document version control up to date, making sure that version numbers match where used, having a review evidenced in the last 12 months, having documents that have no comments in are all good practices.

ISO 27001 Annex A 5.23 FAQ

What policies do I need for ISO 27001 Annex A 5.23 Information security for use of cloud services?

For ISO 27001 Annex A 5.23 Information security for use of cloud services you will need the ISO 27001 Cloud Security Policy.

Are there free templates for ISO 27001 Annex A 5.23?

There are templates for ISO 27001 Annex A 5.23 located in the ISO 27001 Toolkit.

ISO 27001 Annex A 5.23 sample PDF?

ISO 27001 Annex A 5.23 Sample PDF in the ISO 27001 Toolkit.

Do I have to satisfy ISO 27001 Annex A 5.23 for ISO 27001 Certification?

Yes. Whilst the ISO 27001 Annex A clauses are for consideration to be included in your Statement of Applicability there is no reason we can think of that would allow you to exclude ISO 27001 Annex A 5.23. Information security for use of cloud services is a fundamental part of your control framework and any management system. It is explicitly required for ISO 27001.

Can I write polices for ISO 27001 Annex A 5.23 myself?

Yes. You can write the policies for ISO 27001 Annex A 5.23 yourself. You will need a copy of the standard and approximately 5 days of time to do it. It would be advantageous to have a background in information security management systems. Alternatively you can download them in the ISO 27001 Toolkit.

Where can I get templates for ISO 27001 Annex A 5.23?

ISO 27001 templates for ISO 27001 Annex A 5.23 are located in the ISO 27001 Toolkit.

How hard is ISO 27001 Annex A 5.23?

ISO 27001 Annex A 5.23 is hard. The documentation required is extensive. We would recommend templates to fast track your implementation.

How long will ISO 27001 Annex A 5.23 take me?

ISO 27001 Annex A 5.23 will take approximately 1 to 3 month to complete if you are starting from nothing and doing a full implementation. With the right risk management approach and an ISO 27001 Toolkit it should take you less than 1 day.

How much will ISO 27001 Annex A 5.23 cost me?

The cost of ISO 27001 Annex A 5.23 will depend how you go about it. If you do it yourself it will be free but will take you about 1 to 3 months so the cost is lost opportunity cost as you tie up resource doing something that can easily be downloaded and managed via risk management.

Is there an online ISO 27001?

Yes, there is an online ISO 27001 at ISO 27001 Online.

Why is Information Security for use of Cloud Services Important?

ISO 27001 Annex A 5.23 Information security for use of cloud services is important because suppliers represent the biggest risk to you. If they are not doing the right thing it is your reputation, your finances, your success that is stake. Get supplier management correct and reduce the risk.

ISO 27001 Controls and Attribute Values

Control typeInformation
security properties
Operational
capabilities
Security domains
PreventiveConfidentialitySupplier relationships securityProtection
IntegrityGovernance and ecosystem
Availability

ISO 27001:2022 requirements

Organisational Controls - A5

ISO 27001 Annex A 5.1 Policies for information security

ISO 27001 Annex A 5.2 Information Security Roles and Responsibilities

ISO 27001 Annex A 5.3 Segregation of duties

ISO 27001 Annex A 5.4 Management responsibilities

ISO 27001 Annex A 5.5 Contact with authorities

ISO 27001 Annex A 5.6 Contact with special interest groups

ISO 27001 Annex A 5.7 Threat intelligence – new

ISO 27001 Annex A 5.8 Information security in project management

ISO 27001 Annex A 5.9 Inventory of information and other associated assets – change

ISO 27001 Annex A 5.10 Acceptable use of information and other associated assets – change

ISO 27001 Annex A 5.11 Return of assets

ISO 27001 Annex A 5.11 Return of assets

ISO 27001 Annex A 5.13 Labelling of information

ISO 27001 Annex A 5.14 Information transfer

ISO 27001 Annex A 5.15 Access control

ISO 27001 Annex A 5.16 Identity management

ISO 27001 Annex A 5.17 Authentication information – new

ISO 27001 Annex A 5.18 Access rights – change

ISO 27001 Annex A 5.19 Information security in supplier relationships

ISO 27001 Annex A 5.20 Addressing information security within supplier agreements

ISO 27001 Annex A 5.21 Managing information security in the ICT supply chain – new

ISO 27001 Annex A 5.22 Monitoring, review and change management of supplier services – change

ISO 27001 Annex A 5.23 Information security for use of cloud services – new

ISO 27001 Annex A 5.24 Information security incident management planning and preparation – change

ISO 27001 Annex A 5.25 Assessment and decision on information security events 

ISO 27001 Annex A 5.26 Response to information security incidents

ISO 27001 Annex A 5.27 Learning from information security incidents

ISO 27001 Annex A 5.28 Collection of evidence

ISO 27001 Annex A 5.29 Information security during disruption – change

ISO 27001 Annex A 5.31 Identification of legal, statutory, regulatory and contractual requirements

ISO 27001 Annex A 5.32 Intellectual property rights

ISO 27001 Annex A 5.33 Protection of records

ISO 27001 Annex A 5.34 Privacy and protection of PII

ISO 27001 Annex A 5.35 Independent review of information security

ISO 27001 Annex A 5.36 Compliance with policies and standards for information security

ISO 27001 Annex A 5.37 Documented operating procedures 

Technology Controls - A8

ISO 27001 Annex A 8.1 User Endpoint Devices

ISO 27001 Annex A 8.2 Privileged Access Rights

ISO 27001 Annex A 8.3 Information Access Restriction

ISO 27001 Annex A 8.4 Access To Source Code

ISO 27001 Annex A 8.5 Secure Authentication

ISO 27001 Annex A 8.6 Capacity Management

ISO 27001 Annex A 8.7 Protection Against Malware

ISO 27001 Annex A 8.8 Management of Technical Vulnerabilities

ISO 27001 Annex A 8.9 Configuration Management 

ISO 27001 Annex A 8.10 Information Deletion

ISO 27001 Annex A 8.11 Data Masking

ISO 27001 Annex A 8.12 Data Leakage Prevention

ISO 27001 Annex A 8.13 Information Backup

ISO 27001 Annex A 8.14 Redundancy of Information Processing Facilities

ISO 27001 Annex A 8.15 Logging

ISO 27001 Annex A 8.16 Monitoring Activities

ISO 27001 Annex A 8.17 Clock Synchronisation

ISO 27001 Annex A 8.18 Use of Privileged Utility Programs

ISO 27001 Annex A 8.19 Installation of Software on Operational Systems

ISO 27001 Annex A 8.20 Network Security

ISO 27001 Annex A 8.21 Security of Network Services

ISO 27001 Annex A 8.22 Segregation of Networks

ISO 27001 Annex A 8.23 Web Filtering

ISO 27001 Annex A 8.24 Use of CryptographyISO27001 Annex A 8.25 Secure Development Life Cycle

ISO 27001 Annex A 8.26 Application Security Requirements

ISO 27001 Annex A 8.27 Secure Systems Architecture and Engineering Principles

ISO 27001 Annex A 8.28 Secure Coding

ISO 27001 Annex A 8.29 Security Testing in Development and Acceptance

ISO 27001 Annex A 8.30 Outsourced Development

ISO 27001 Annex A 8.31 Separation of Development, Test and Production Environments

ISO 27001 Annex A 8.32 Change Management

ISO 27001 Annex A 8.33 Test Information

ISO 27001 Annex A 8.34 Protection of information systems during audit testing