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📖 What is Least Privilege?

Least privilege is a security principle requiring users be granted only the minimum necessary access rights to perform their defined job functions. This limits potential damage from malicious actors or accidental errors by restricting access to sensitive data and critical system resources.

🥋 Sensei Says:

"Exam questions frequently test understanding of least privilege in relation to RBAC and segregation of duties. Be prepared to analyze scenarios and identify violations of this principle. It’s a core concept for reducing the attack surface."

📚 Certification: Certified Information Security Manager (CISM)

🔑 What are the Key Concepts of Least Privilege?

▸ Least privilege minimizes the blast radius of security incidents by limiting user access to only what's essential for their role.
▸ Role-Based Access Control (RBAC) is a common implementation of least privilege, assigning permissions based on job function.
▸ Regular access reviews and user account audits are crucial to maintaining least privilege and identifying unnecessary permissions.
▸ Applying least privilege extends beyond user accounts to include applications, processes, and network access controls.
▸ Segregation of duties complements least privilege by preventing a single individual from controlling critical processes end-to-end.

🎯 How does Least Privilege appear on the CISM Exam?

You may be asked to identify which security control best implements the principle of least privilege in a new system deployment, choosing from options like multi-factor authentication, data encryption, or RBAC.

A scenario might describe a database administrator with excessive permissions – expect questions about the risks and remediation steps to enforce least privilege.

Expect questions about how least privilege impacts incident response; for example, limiting access to compromised accounts to contain the breach.

❓ Frequently Asked Questions

How does least privilege relate to the concept of 'need to know'?

While similar, 'need to know' is broader. Least privilege defines *how much* access is granted, while 'need to know' determines *who* gets access based on specific requirements for a task.

What are the challenges of implementing least privilege in a complex organization?

Implementing least privilege can be complex due to legacy systems, user resistance, and the effort required for ongoing maintenance and access reviews. Automation tools can help.

Can least privilege be applied to non-human accounts (e.g., service accounts)?

Absolutely. Service accounts should also adhere to least privilege, only being granted the permissions necessary to perform their specific automated tasks. This is often overlooked but critical.

Related Terms from Certified Information Security Manager

Control Objective Risk Management Framework Threat Agent Information Security Program Access Control Privileged Access Management (PAM)

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