Unauthenticated SMB Authentication Coercion in Windows

Executive Summary

This vulnerability allows an unauthenticated attacker on the network to force a service account to perform SMB authentication. This could lead to unauthorized access or further exploitation depending on the service account's permissions.

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Detection Guidance

This vulnerability allows unauthenticated network attackers to coerce SMB authentication. Detection typically involves monitoring for unusual SMB authentication attempts or traffic patterns. Check for unexpected connections to SMB ports (445/tcp) and analyze authentication logs for anomalies. Use network monitoring tools like Wireshark to capture and inspect SMB traffic for signs of coercion attempts.

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Impact Analysis

An attacker could exploit this to gain access to sensitive data or systems if the service account has elevated privileges. It may also enable lateral movement within a network or facilitate further attacks.

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Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR or HIPAA requirements for data protection and access controls. Non-compliance may result in legal penalties or reputational damage.

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Mitigation Strategies

Disable SMBv1 protocol if enabled, restrict SMB access to trusted networks, and monitor for unusual authentication attempts. Update SMB services to the latest patched versions.

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