OpenEMR Missing Authorization in Patient Validation Module

Executive Summary

OpenEMR before version 8.5.0 has a missing authorization flaw in the Patient Validation module. This allows any authenticated user to access patient demographic records without proper permission checks. Attackers can exploit this by sending requests with wildcard or empty parameters to the patientvalidation endpoint, enabling them to retrieve all records from the patient_data table.

Useful 0 Not Useful 0

Detection Guidance

To detect this vulnerability, monitor network traffic for suspicious requests to the patientvalidation endpoint with wildcard or empty parameters. Check server logs for repeated queries with mf_lname or mf_ parameters. Use tools like curl to test the endpoint: curl -u username:password 'http://target/openemr/interface/main/patient_file/encounter/patientvalidation.php?mf_lname=*'

Useful 0 Not Useful 0

Impact Analysis

If you are an OpenEMR user before version 8.5.0, an attacker with valid credentials could steal sensitive patient information, including names, contact details, and medical data. This could lead to privacy breaches, identity theft, or unauthorized use of personal health information.

Useful 0 Not Useful 0

Compliance Impact

This vulnerability likely violates GDPR and HIPAA requirements for protecting personal and health data. GDPR mandates strict access controls and data protection, while HIPAA requires safeguards for protected health information. A breach could result in legal penalties, fines, and reputational damage.

Useful 0 Not Useful 0

Mitigation Strategies

Immediately upgrade OpenEMR to version 8.5.0 or later to patch the missing authorization flaw. If immediate upgrade is not possible, restrict access to the patientvalidation endpoint via firewall rules or web application firewall (WAF) to prevent unauthorized queries.

Useful 0 Not Useful 0