LDAP Injection in Red Hat Quay

Executive Summary

This vulnerability is in Red Hat Quay's LDAP authentication system. When an LDAP referral is returned during login, the system fails to properly escape the username input. This allows attackers to inject special LDAP filter characters, which can be used to test if a user exists in the system (user-existence oracle attack). It may also affect which directory is used for password checks in multi-domain Active Directory setups.

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Detection Guidance

This vulnerability involves improper LDAP username input handling during authentication with Red Hat Quay. Detection requires checking Quay's LDAP authentication logs for unusual LDAP filter characters or referral responses. Inspect logs for patterns like unescaped special characters in usernames or unexpected DN bindings. No specific commands are provided in the context.

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Impact Analysis

An attacker could exploit this to determine valid usernames in your system, which may aid further attacks like brute force or social engineering. In multi-domain environments, it might redirect password checks to unintended directories, potentially allowing unauthorized access if combined with other flaws.

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Compliance Impact

This vulnerability could lead to unauthorized access or information disclosure, violating confidentiality requirements in GDPR and HIPAA. It may result in non-compliance due to insufficient authentication controls and potential exposure of user data.

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Mitigation Strategies

Apply the latest security patches or updates for Red Hat Quay to address the LDAP authentication flaw. Review and restrict LDAP referral handling configurations to prevent username injection. Monitor authentication logs for suspicious LDAP filter metacharacter usage or unusual DN binding attempts.

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