OpenEMR Missing Authorization in CCDA Document Access

Executive Summary

OpenEMR before version 8.5.0 has a missing authorization vulnerability in the ccdaservice/ccda_gateway.php file. This flaw allows any authenticated low-privilege staff user to access other patients' C-CDA documents without proper permission checks.

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Detection Guidance

Check OpenEMR logs for repeated requests to ccdaservice/ccda_gateway.php with view or dl actions and sequential patient IDs. Monitor network traffic for unauthorized data exfiltration attempts targeting patient records.

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Impact Analysis

Attackers can exploit this by sending requests with sequential patient IDs and their own CSRF token to view or download sensitive health information such as medications, problems, allergies, and immunizations for other patients.

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Compliance Impact

This vulnerability likely violates privacy regulations like HIPAA and GDPR by allowing unauthorized access to protected health information, potentially leading to legal penalties and reputational damage.

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Mitigation Strategies

Upgrade OpenEMR to version 8.5.0 or later to patch the missing authorization flaw. Implement strict access controls to restrict low-privilege users from accessing other patients' C-CDA documents.

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