Keycloak Group Membership Bypass via Name Matching

Executive Summary

This vulnerability is in Keycloak's client policy enforcement. It occurs when the system checks group membership by name instead of a unique identifier. An attacker with client management privileges could bypass security policies by joining a group with a matching name in a different part of the group hierarchy. This allows them to register or update clients without following required security hardening profiles.

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Detection Guidance

To detect this vulnerability, review Keycloak group membership checks. Verify if group membership is validated by name rather than unique identifier. Check client policies for unauthorized registrations or updates. Inspect logs for suspicious group join activities or policy bypass attempts.

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Impact Analysis

If exploited, this vulnerability could allow unauthorized users to register or modify clients in Keycloak without adhering to security policies. This might lead to unauthorized access, privilege escalation, or other security breaches depending on the system's configuration and usage.

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Compliance Impact

This vulnerability could undermine compliance with GDPR, HIPAA, or other regulations by allowing unauthorized access or modifications to client configurations. It may lead to violations of data protection, access control, or audit requirements, depending on the affected system's role in handling sensitive data.

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Mitigation Strategies

Update Keycloak to the latest version that addresses this flaw. Review and enforce group membership checks using unique identifiers instead of names. Restrict client management privileges to trusted users only.

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