Account Lock Bypass in User Store Integration

Executive Summary

This vulnerability involves a flaw in the account lockout mechanism where identical usernames in primary and secondary user stores cause the lock condition to only apply to the secondary account. This allows attackers to bypass the lockout and perform brute force attacks against the primary account.

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Detection Guidance

This vulnerability allows brute force attacks due to improper account lockout enforcement. To detect it, monitor authentication logs for repeated failed login attempts against accounts, especially where identical usernames exist in multiple user stores. Check for patterns of continuous login attempts without account lockouts being triggered.

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Impact Analysis

An attacker could exploit this to repeatedly guess passwords for the primary account, potentially gaining unauthorized access to sensitive data or systems. This could lead to data breaches, account takeovers, or other security incidents.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, which may violate GDPR's data protection requirements and HIPAA's safeguards for protected health information. The lack of proper account lockout enforcement increases the risk of data breaches, potentially resulting in non-compliance with these regulations.

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Mitigation Strategies

Review and update account lockout policies to ensure they apply consistently across all user stores. Verify that identical usernames in primary and secondary stores are handled uniformly to prevent bypass of lockout mechanisms.

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