Allocation of Resources Without Limits in Active Directory Federation Services

Executive Summary

This vulnerability is a denial-of-service issue in Active Directory Federation Services (AD FS) where an attacker can exploit the lack of resource limits or throttling to exhaust system resources over a network.

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Detection Guidance

Monitor AD FS service logs for unusual resource consumption or service degradation. Check for excessive authentication requests or failed login attempts targeting AD FS servers. Use performance monitoring tools to track CPU, memory, and network usage on AD FS servers.

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Impact Analysis

An unauthorized attacker could disrupt services by overwhelming AD FS with excessive requests, causing legitimate users to lose access to federated services and applications.

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Compliance Impact

This vulnerability enables denial-of-service attacks against AD FS, which could disrupt authentication services for critical systems. Such disruptions may impact compliance with GDPR by affecting data access controls and HIPAA by impairing secure authentication for protected health information systems.

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Mitigation Strategies

Apply the latest security updates from Microsoft for AD FS. Implement rate limiting or throttling for authentication requests. Restrict network access to AD FS servers using firewalls. Monitor and log AD FS activity for suspicious behavior.

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