ISO 27001 Annex A 5.27 Learning From Information Security Incidents

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ISO 27001 Learning From Information Security Incidents

In this ultimate guide to ISO 27001 Annex A 5.27 Learning From Information Security Incidents you will learn

  • What is ISO 27001 Annex A 5.27
  • How to implement ISO 27001 Annex A 5.27

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 5.27 Learning From Information Security Incidents?

ISO 27001 Annex A 5.27 Learning from information security incidents is an ISO 27001 control that requires an organisation to learn from information security events to improve.

ISO 27001 Annex A 5.27 Purpose

The purpose of ISO 27001 Annex A 5.27 is a preventive control that ensures the reduction in the likelihood or consequences of future incidents.

ISO 27001 Annex A 5.27 Definition

ISO 27001 defines Annex A 5.27 as:

Knowledge gained from information security incidents should be used to strengthen and improve the information security controls.

ISO 27001:2022 Annex A 5.27 Learning from information security incidents

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ISO 27001 Annex A 5.27 Implementation Guide

An information security incident is an event that could potentially have a negative impact on the confidentiality, integrity, or availability of information. The consequences of an incident can vary depending on the nature of the incident, the systems and data affected, and the organisations response.

As part of your incident management you are going to implement a step that looks at learning from incidents. You will consider this documented process and how you will analyse incidents, identify the root cause and then make decisions on corrective actions as required.

Root Cause Analysis

What is root cause analysis?

It is technique that looks to see what the actual cause of an incident was. It is not about identifying the symptoms but what actually caused them and the incident to occur. Consider, I have put on weight. Root cause does not look at the fact your clothes do not fit any more but on why. Through analysis you would likely discover the root cause is you eat too much and don’t exercise enough.

How to perform root cause analysis

A good way to is to use the technique of the Five Why’s. By asking the question why five times in a row you can get to the root of the problem.

I have put on weight.

Why? Because I am bigger than before

Why? Because I eat too much

Why? Because I am unhappy

Why? Because I work too hard

Why? Because I need money.

Root cause of all evil = money.

It can actually be a very effective technique.

What to do with the result

Once we know what the root cause of an information security incident is we can now start to make decision as to what to do. It may be that

  • This requires no further action
  • This requires corrective action
  • This requires continual improvement
  • This is a risk and needs to be managed via risk management

Implementation Conclusion

This guide provides a framework for identifying the root cause, lessons learnt and improvements of an information security incident. The guide should be used in conjunction with your information security incident management plan.

The standard that relates to information security management for further reading if required is ISO/IEC 27035

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ISO 27001 Templates

You can save months of effort with these templates that take 25 years of experience and distill it in a pack of prewritten best practice awesomeness. We have included guides on how to respond to incidents and resources to help your implementation.

How to comply

To comply with ISO 27001 Annex A 5.27 you are going to implement the ‘how’ to the ‘what’ the control is expecting. In short measure you are going to:

  1. Manage information security incidents to resolution
  2. Perform root cause analysis to identify what caused it
  3. Make a decision on what to do next
  4. Record information security lessons learnt.

How to pass an audit

To pass an audit of ISO 27001 Annex A 5.27 Learning from information security incidents you are going to make sure that you have followed the steps above in how to comply.

  1. Have a documented process for root cause analysis and lessons learnt.
  2. Implement the lessons learnt process
  3. Monitor the effectiveness of the lessons learnt process
  4. Review and update the lessons learnt process as needed.

You are going to check that it is working 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 main ones

1. That you have documented your root cause and lessons learnt process

The audit will check the documentation, that you have reviewed it and signed and it off and that it represents what you actually do not what you think they want to hear.

2. That you can demonstrate the process working

They are going to ask you for evidence to the lessons learnt process and take one example. For this example you are going to show them and walk them through the process and prove that you followed it and that the process worked.

3. That you can learn your lesson

Documenting your lessons learnt and following this through to continual improvements or incident and corrective actions will be checked. They want to see that not only did you respond but that you learnt from it and did something to improve that reduced or eliminated the possibility of it happening again.

Top 3 Mistakes People Make

The top 3 Mistakes People Make For ISO 27001 Annex A 5.27 are

1. Not having a documented information security incident management plan.

This is the most common mistake made by organisations. A documented information security incident management plan is essential for effective incident response. It should include the following:

  • A process for root cause analysis and lessons learnt

2. Not implementing the information security incident management plan.

Even if you have a documented information security incident management plan, it is not enough to simply have the plan. The plan must be implemented in order to be effective. This means assigning responsibility for implementing the plan, providing training on the plan, and testing the plan.

3. Not monitoring the effectiveness of the information security incident management lessons learnt.

Once the information security incident management lessons learnt is implemented, it is important to monitor its effectiveness. This means reviewing reports of information lessons learnt, root cause analysis, risk registers, corrective action logs and actual corrective actions implemented as needed.

By avoiding these mistakes, you can ensure that you have an effective information security incident management plan in place.

Why is Learning from Information Security Incidents Important?

As the saying goes, shit happens. It is facts of life. No system or security is 100% We cannot be on the back foot when the inevitable happens and effective incident management can eliminate or reduce the impact of information security incidents.

ISO 27001 Annex A 5.27 is important because it provides guidance on how we learn and continually improve as a result of incidents. Information security incidents can have a significant impact on an organisation, so it is important to have a plan in place for how to reduce them in future. The guidance in ISO 27001 Annex A 5.27 can help you to develop and implement an effective information security incident lessons learnt plan.

The following are some of the benefits of having an effective information security incident lessons learnt process:

  • It can help to reduce the impact of information security incidents.
  • It can help to protect the organisations reputation.
  • It can help to comply with legal and regulatory requirements.
  • It can help to improve the organisations overall information security posture.

ISO 27001 Annex A 5.27 FAQ

What is ISO 27001 Clause 5.27?

ISO 27001 Annex A 5.27 is a control that requires organisations to learn from, and improve as a result of, information security incidents.

What are the steps involved in incident lessons learnt?

Perform root cause analysis
Make a decision based on the root cause
Document the process and results

What types of information security security incidents are there?

The most common types of information security incidents are
1. Accidental Incidents
2. Malicious Incidents
3. Natural Disaster / Environmental Incidents

Do I have to satisfy ISO 27001 Annex A 5.27 Learning from information security incidents for ISO 27001 Certification?

Yes. It is required for ISO 27001.

ISO 27001 Annex A 5.27 sample PDF?

ISO 27001 Annex A 5.27 Sample PDF in the ISO 27001 Toolkit.

Where can I get templates for ISO 27001 Annex A 5.27 Learning from information security incidents?

ISO 27001 templates for Annex A 5.27 Learning from information security incidents are located in the ISO 27001 Toolkit.

How hard is ISO 27001 Annex A 5.27 Learning from information security incidents?

ISO 27001 Annex A 5.27 is not hard.

How long will ISO 27001 Annex A 5.27 Learning from information security incidents take me?

ISO 27001 Annex A 5.27 will take approximately 1 week to complete if you are starting from nothing and doing it yourself.

Are there free templates for ISO 27001 Annex A 5.27?

There are templates for ISO 27001 Annex A 5.27 located in the ISO 27001 Toolkit.

What are the roles and responsibilities involved in information security management?

Typically they are:
Incident Manager: Managing and coordinating the incident
Incident Response Team: the people responding to the incident
The Legal Team: providing legal advice
The Information Security Team: maintaining the confidentiality, integrity and availability of data.
Communications Team: keeping interested parties appropriately informed

What are some common mistakes that organisations make when complying with ISO 27001 Annex A 5.27?

Not having root cause analysis for information security incidents
Not having corrective action in place for information security incidents
Not tying it to the risk register where appropriate

Is there an online ISO 27001?

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

ISO 27001 controls and attribute values

Control typeInformation
security properties
Cybersecurity
concepts
Operational
capabilities
Security domains
PreventiveConfidentialityIdentifyInformation Security Event ManagementDefence
IntegrityProtect
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