CVE-2017-12795
📋 TL;DR
CVE-2017-12795 is an improper input validation vulnerability in OpenMRS HTML Form Entry module that allows attackers to execute arbitrary code on affected systems. This affects OpenMRS installations using the vulnerable module version, potentially compromising patient health data and system integrity. The vulnerability stems from insufficient validation of user-supplied input in the HTML form processing component.
💻 Affected Systems
- OpenMRS HTML Form Entry Module
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing remote code execution, data exfiltration of sensitive patient health information, and potential ransomware deployment across the healthcare system.
Likely Case
Unauthorized access to patient records, modification of medical data, and potential installation of backdoors for persistent access to the healthcare system.
If Mitigated
Limited impact with proper input validation and sanitization, potentially only causing application errors or denial of service.
🎯 Exploit Status
The CVSS 9.8 score indicates critical severity with network access and no authentication required. While no public exploit code is documented, the vulnerability type suggests straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after commit 86f35221c8a57cdd7557ce731a56b90db216c8e0
Vendor Advisory: https://github.com/openmrs/openmrs-module-htmlformentry/commit/86f35221c8a57cdd7557ce731a56b90db216c8e0
Restart Required: Yes
Instructions:
1. Update OpenMRS HTML Form Entry module to latest version. 2. Apply commit 86f35221c8a57cdd7557ce731a56b90db216c8e0. 3. Restart OpenMRS application server. 4. Verify module functionality post-update.
🔧 Temporary Workarounds
Disable HTML Form Entry Module
allTemporarily disable the vulnerable module if immediate patching isn't possible
# In OpenMRS administration interface, navigate to Module Management and disable 'htmlformentry' module
Web Application Firewall Rules
allImplement WAF rules to block suspicious HTML form submissions
# Example ModSecurity rule: SecRule ARGS "@rx malicious_pattern" "id:1001,phase:2,deny"
🧯 If You Can't Patch
- Implement strict input validation at application layer for all HTML form submissions
- Deploy network segmentation to isolate OpenMRS systems from general network access
🔍 How to Verify
Check if Vulnerable:
Check OpenMRS module version via administration interface or examine module JAR file version metadataCheck Version:
# Check module version in OpenMRS: grep 'htmlformentry' /path/to/openmrs/modules/version.propertiesVerify Fix Applied:
Verify module version is updated beyond vulnerable version and test HTML form submission functionality📡 Detection & Monitoring
Log Indicators:
- Unusual HTML form submission patterns
- Exception stack traces containing input validation errors
- Unexpected system command execution in logs
Network Indicators:
- Unusual outbound connections from OpenMRS server
- Large data exfiltration from patient database
SIEM Query:
source="openmrs.log" AND ("htmlformentry" OR "input validation") AND severity=ERROR🔗 References
- http://openmrs-module-htmlformentry.com
- http://openmrs.com
- https://github.com/openmrs/openmrs-module-htmlformentry/commit/86f35221c8a57cdd7557ce731a56b90db216c8e0
- https://github.com/openmrs/openmrs-module-htmlformentry/compare/f50bdf1...cc0be04
- http://openmrs-module-htmlformentry.com
- http://openmrs.com
- https://github.com/openmrs/openmrs-module-htmlformentry/commit/86f35221c8a57cdd7557ce731a56b90db216c8e0
- https://github.com/openmrs/openmrs-module-htmlformentry/compare/f50bdf1...cc0be04
