IAM Permissions Boundaries are critical for maintaining security in AWS by limiting permissions for IAM roles and users. They do not provide additional powers but set a ceiling on actions that can be performed. When evaluating permissions, both the IAM policy and permissions boundary must agree for an action to be successful. This feature is particularly crucial for organizations that practice delegated administration to ensure that teams can operate independently without compromising security.
IAM Permissions Boundaries act as a safety net in AWS security, establishing a maximum limit on permissions for IAM entities while still allowing autonomy for teams.
A permissions boundary is an advanced IAM feature that enforces a ceiling on what users can do, regardless of their attached policies.
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