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Least Privilege
Definition
The principle of least privilege states that every user, application, or process should have only the minimum access rights needed to perform their task.
The principle of least privilege states that every user, application or process should have only the minimum access rights needed to perform its task, no more and no less. According to the Verizon DBIR 2024, privilege abuse is involved in over 40% of all security incidents, making least privilege one of the most fundamental security principles.
How does least privilege work?
Least privilege reduces the attack surface by limiting every account's, application's and process's rights to the absolute minimum. If a limited account is compromised, the attacker can cause far less damage than with a broadly privileged account.
Implementation of least privilege
RBAC assigns rights based on organisational roles. JIT access grants time-limited rights that are automatically revoked. JEA limits rights to the minimum for the specific task. Regular access reviews evaluate whether rights are still needed. Automated onboarding and offboarding ensures rights are revoked upon role change or departure.
Impact on organisations
Excessive rights are one of the largest internal risks. Non-revoked accounts, overprivileged service accounts and users with unnecessary rights provide easy escalation paths. NIS2 requires adequate access control. ISO 27001 sets extensive least privilege requirements. PCI DSS mandates need-to-know access. Zero Trust architecture requires consistently applied least privilege.
Protection
Audit all existing rights and eliminate excessive privileges. Implement RBAC linked to HR systems. Apply JIT/JEA for admin access. Monitor all rights changes. Conduct quarterly access reviews.
How DEFION helps
DEFION tests least privilege implementation as part of pentests and Security Assessments. The team identifies excessive rights and escalation paths.