Authorization Bypass in Katello via RegistryProxiesController

Executive Summary

This is an authorization bypass vulnerability in rubygem-katello's RegistryProxiesController. Due to a missing return statement in the registry_authorize filter, unauthorized requests bypass access controls. Attackers can enumerate valid users, organizations, and products by observing different error responses. Invalid users trigger server crashes while valid users receive 404 errors, confirming their existence.

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Detection Guidance

To detect this vulnerability, monitor HTTP responses from the RegistryProxiesController in Katello. Invalid users trigger 500 errors while valid users receive 404 errors. Use tools like curl to send test requests and observe response codes for user enumeration attempts.

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Impact Analysis

An attacker could exploit this to map your system's hidden organizational structure and identify valid users, organizations, and products. This information could be used for further attacks, including data enumeration or chaining with other vulnerabilities like SQL injection. The impact is limited to information disclosure since no direct data modification or deletion occurs.

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Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by exposing sensitive user, organization, and product data through enumeration attacks. Unauthorized access to such data may violate confidentiality requirements under these regulations.

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Mitigation Strategies

Apply patches from Red Hat if available. As mitigation options are currently unavailable per Red Hat, consider temporarily disabling the RegistryProxiesController or restricting access to trusted networks until official fixes are released.

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