Authorization Code Theft in Red Hat Build of Keycloak

Executive Summary

This vulnerability involves OAuth 2.0 authorization codes in Red Hat Build of Keycloak not being properly bound to the original requesting client. An attacker can intercept an authorization code and modify it to be redeemed by their own client, allowing them to obtain access tokens for a victim's identity.

Useful 0 Not Useful 0

Detection Guidance

Monitor Keycloak token endpoint logs for unusual authorization code redemption attempts. Check for mismatches between the client ID in the authorization code and the client ID used during token redemption. Look for multiple redemption attempts of the same authorization code from different client sessions.

Useful 0 Not Useful 0

Impact Analysis

An attacker could impersonate you to an attacker-controlled client and access your data exposed to that client. This requires the attacker to register a client, establish an SSO session with you, and intercept an authorization code.

Useful 0 Not Useful 0

Compliance Impact

This vulnerability could lead to unauthorized access to user data, potentially violating GDPR's data protection principles and HIPAA's access controls. If exploited, it may result in unauthorized disclosure of personal or health information, undermining compliance with these regulations.

Useful 0 Not Useful 0

Mitigation Strategies

Update Keycloak to the latest patched version immediately. Review and restrict client registrations in the same realm. Monitor for suspicious token redemption activities. Consider disabling OAuth 2.0 authorization code flow temporarily if an update is not immediately available.

Useful 0 Not Useful 0