Unconstrained Delegation in Active Directory: Risks & Defenses

Executive Summary

Unconstrained delegation in Active Directory (AD) poses significant cybersecurity risks, allowing attackers to impersonate users and access sensitive information. This article by Semperis explores unconstrained delegation's definition, detection methods, and defenses against potential exploits. Organizations are urged to strengthen AD security measures, as vulnerabilities can be exploited using sophisticated techniques highlighted in a recent report from the Five Eyes alliance. Effective mitigation strategies are essential for protecting critical systems from cyber threats.

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Key Insights

What is Unconstrained Delegation?

• Unconstrained delegation allows designated services or computers to impersonate users throughout the domain once authenticated.
• It enables the forwarding of Kerberos Ticket Granting Tickets (TGTs), stored in memory, which can be exploited if compromised.

Risks Associated with Unconstrained Delegation

• Attackers can leverage compromises via unconstrained delegation to gain elevated privileges, potentially resulting in unauthorized access to sensitive data.
• The Five Eyes alliance has reported multiple tactics used by threat actors to exploit vulnerable Active Directory configurations.

Defending Against Unconstrained Delegation Exploits

• Implement best practices in securing Active Directory, such as disabling unconstrained delegation where it's not necessary.
• Regularly audit AD configurations to identify services that should not use delegation.

Detecting Unconstrained Delegation

• Utilize security tools to monitor ticket usage and detect unusual patterns that may indicate exploitation attempts.
• Establish a baseline of normal network activity to better identify anomalies.

Red Team Training and Resources

• Participate in red team exercises to assess the robustness of your defenses against attacks leveraging unconstrained delegation.
• Access additional resources from cybersecurity agencies to stay informed about evolving threats and defenses.

👉 Access the full expert analysis and actionable security insights from Semperis here.