Privilege Escalation in 389 Directory Server via SASL PLAIN

Executive Summary

This vulnerability is in 389 Directory Server where during SASL PLAIN authentication, the server sets up authenticated credentials before checking if the account is locked. If the account is locked after credentials are set, the server reports failure to the client but does not remove the already-established authenticated state. This allows a client with valid credentials for a locked account to retain access privileges on the same connection.

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Detection Guidance

This vulnerability can be detected by checking for unauthorized access attempts using locked accounts via SASL PLAIN authentication. Monitor logs for successful binds followed by administrative lock actions. No specific commands are provided in the context.

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Impact Analysis

If you use 389 Directory Server with SASL PLAIN authentication, an attacker could exploit this flaw to gain unauthorized access to a locked account by maintaining an active connection with the account's privileges. This defeats the purpose of account lockout as a security measure.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating confidentiality requirements in GDPR and HIPAA. It undermines access control mechanisms, potentially resulting in non-compliance with data protection regulations.

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Mitigation Strategies

Immediately update 389 Directory Server to the latest patched version. Disable SASL PLAIN authentication if possible and enforce stricter account lockout policies. Review logs for any signs of exploitation.

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