CVE-2020-27227
📋 TL;DR
CVE-2020-27227 is an unauthenticated command injection vulnerability in OpenClinic GA that allows remote attackers to execute arbitrary commands on the server. This affects OpenClinic GA version 5.173.3 and potentially earlier versions. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- OpenClinic GA
📦 What is this software?
Openclinic Ga by Openclinic Ga Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover, database exfiltration, credential theft, and persistent backdoor installation.
Likely Case
Database compromise and credential theft leading to further lateral movement within the network.
If Mitigated
Limited impact with proper network segmentation and web application firewalls in place.
🎯 Exploit Status
The vulnerability requires sending specially crafted web requests with specific parameters to trigger command execution.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to latest version (check vendor for specific patched version)
Vendor Advisory: https://www.openclinic.com/security-advisories/
Restart Required: Yes
Instructions:
1. Backup your OpenClinic GA installation and database
2. Download the latest patched version from the official vendor
3. Follow vendor upgrade instructions
4. Restart the application service
5. Verify the fix is applied
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict network access to OpenClinic GA to only trusted IP addresses
iptables -A INPUT -p tcp --dport [OPENCLINIC_PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [OPENCLINIC_PORT] -j DROP
Web Application Firewall
allDeploy WAF with command injection protection rules
🧯 If You Can't Patch
- Isolate the OpenClinic GA server in a separate network segment with strict access controls
- Implement application-level input validation and sanitization for all user inputs
🔍 How to Verify
Check if Vulnerable:
Check if running OpenClinic GA version 5.173.3 or earlier. Review application logs for suspicious command execution attempts.Check Version:
Check the OpenClinic GA web interface or configuration files for version informationVerify Fix Applied:
Verify the OpenClinic GA version has been updated beyond 5.173.3. Test with known exploit payloads to confirm they no longer work.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Suspicious web requests with shell metacharacters
- Multiple failed login attempts followed by command execution
Network Indicators:
- HTTP requests containing shell commands or special characters in parameters
- Outbound connections from OpenClinic server to unknown IPs
SIEM Query:
source="openclinic.logs" AND ("cmd.exe" OR "/bin/sh" OR "bash" OR "powershell" OR "|" OR ";" OR "$" OR "`")