CVE-2024-37734
📋 TL;DR
CVE-2024-37734 is a privilege escalation vulnerability in OpenEMR 7.0.2 that allows remote attackers to gain elevated privileges by sending a specially crafted POST request with a manipulated noteid parameter. This affects all OpenEMR 7.0.2 installations with the vulnerable component enabled. Attackers can potentially gain administrative access to the medical records system.
💻 Affected Systems
- OpenEMR
📦 What is this software?
Openemr by Open Emr
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise where attacker gains administrative privileges, accesses/modifies sensitive patient medical records, installs malware, or disrupts healthcare operations.
Likely Case
Attacker gains elevated privileges to access confidential patient data, modify records, or perform unauthorized actions within the OpenEMR system.
If Mitigated
Limited impact with proper network segmentation, strong authentication, and monitoring detecting the privilege escalation attempt.
🎯 Exploit Status
Exploit requires sending a crafted POST request. The GitHub references show proof-of-concept details and the vulnerability is being actively discussed in the community.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in OpenEMR versions after 7.0.2 (check pull request #7435 for specific version)
Vendor Advisory: https://github.com/openemr/openemr/pull/7435
Restart Required: Yes
Instructions:
1. Backup your OpenEMR installation and database. 2. Update to the latest OpenEMR version that includes the fix from pull request #7435. 3. Restart the web server. 4. Verify the fix by testing the vulnerable endpoint.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation for the noteid parameter in POST requests
Modify relevant PHP files to validate noteid parameter format and range
Web Application Firewall Rule
allBlock or monitor suspicious POST requests containing noteid parameter manipulation
WAF rule: Block POST requests with noteid parameter containing non-numeric or suspicious values
🧯 If You Can't Patch
- Implement strict network segmentation to isolate OpenEMR from untrusted networks
- Enable detailed logging and monitoring for POST requests to note-related endpoints
🔍 How to Verify
Check if Vulnerable:
Check if running OpenEMR version 7.0.2. Test by attempting to send crafted POST requests to note-related endpoints with manipulated noteid parameter.Check Version:
Check OpenEMR version in the interface or examine version.php file: cat /path/to/openemr/version.php | grep '\$v_\|version'Verify Fix Applied:
After patching, attempt the same exploit technique and verify it fails. Check that noteid parameter validation is properly implemented.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to note-related endpoints
- Multiple failed privilege escalation attempts
- Suspicious noteid parameter values in access logs
Network Indicators:
- POST requests with manipulated noteid parameters
- Unusual traffic patterns to OpenEMR note endpoints
SIEM Query:
source="openemr_logs" AND (method="POST" AND uri CONTAINS "note" AND (noteid!="[0-9]+" OR noteid="0" OR noteid="null"))