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What are the best practices for securing a system from unauthorized changes?

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Unauthorized changes to a system can compromise its functionality, security, and reliability. As a systems engineer, you need to follow some best practices to prevent or detect any unauthorized changes and ensure the system meets its requirements and standards. In this article, we will discuss some of these best practices, such as defining configuration management roles and responsibilities, establishing baselines and change control processes, implementing security controls and audits, and using tools and techniques for configuration identification and verification.

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1 Configuration management roles and responsibilities

One of the first steps to secure a system from unauthorized changes is to define the configuration management roles and responsibilities. Configuration management is the process of managing the changes to a system and its components throughout its life cycle. It involves identifying, controlling, verifying, and documenting the system configuration. You need to assign clear roles and responsibilities for the configuration management team, such as the configuration manager, the configuration control board, the configuration item owners, and the configuration auditors. These roles and responsibilities should be documented in a configuration management plan that defines the scope, objectives, policies, procedures, and tools for configuration management.

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The configuration manager is a manager who has the ability and authority to ensure daily end-to-end delivery of CM services in accordance with the configuration management plan. The configuration manager’s specific responsibilities include: ? Managing the day-to-day activities of the process, including establishing priorities and work assignments ? Tracking compliance to policies and procedures and resolving or escalating any compliance issues ? Facilitating CM audits ? Reviewing critical incident outage resolution results and responses and dispositions of failed changes due to issues related to the configuration management system (CMS)

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2 Baselines and change control processes

Another best practice to secure a system from unauthorized changes is to establish baselines and change control processes. A baseline is a reference point that captures the approved configuration of a system or a component at a specific point in time. It serves as a basis for comparison and verification of any changes. A change control process is a formal procedure that defines how changes to the system or its components are proposed, evaluated, approved, implemented, and documented. It ensures that changes are consistent with the system requirements and standards, and that they do not introduce any errors or risks. You need to create and maintain baselines for the system and its components, and follow the change control process for any changes to the baselines.

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3 Security controls and audits

A third best practice to secure a system from unauthorized changes is to implement security controls and audits. Security controls are measures that protect the system and its components from unauthorized access, modification, or destruction. They include physical, technical, and administrative controls, such as locks, passwords, encryption, firewalls, backups, policies, and training. Security audits are reviews that assess the effectiveness of the security controls and identify any vulnerabilities or weaknesses. You need to apply security controls to the system and its components, and conduct regular security audits to verify the compliance and integrity of the system configuration.

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4 Tools and techniques for configuration identification and verification

A fourth best practice to secure a system from unauthorized changes is to use tools and techniques for configuration identification and verification. Configuration identification is the process of naming, labeling, and describing the system and its components, and their relationships and dependencies. Configuration verification is the process of checking that the system and its components match their baselines and specifications. You need to use tools and techniques that facilitate configuration identification and verification, such as configuration management software, version control systems, configuration status accounting, configuration audits, and traceability matrices. These tools and techniques help you to track, monitor, and report the changes to the system configuration.

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5 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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What are the best practices for securing a system from unauthorized changes?

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3

4

5

1 Configuration management roles and responsibilities

2 Baselines and change control processes

3 Security controls and audits

4 Tools and techniques for configuration identification and verification

5 Here’s what else to consider

Systems Engineering

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What are the best practices for securing a system from unauthorized changes?

1

2

3

4

5

1 Configuration management roles and responsibilities

2 Baselines and change control processes

3 Security controls and audits

4 Tools and techniques for configuration identification and verification

5 Here’s what else to consider

Systems Engineering

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