CVE-2022-22055
📋 TL;DR
CVE-2022-22055 is a critical SQL injection vulnerability in the Le-yan dental management system login page. Unauthenticated attackers can execute arbitrary SQL commands to gain administrator privileges, potentially taking full control of the system. Any organization using the vulnerable Le-yan dental management software is affected.
💻 Affected Systems
- Le-yan Dental Management System
📦 What is this software?
Le Yan Dental Management System by Le Yan Dental Management System Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise: attacker gains administrator access, exfiltrates sensitive patient data, modifies or deletes records, installs malware, and disrupts dental practice operations.
Likely Case
Attacker gains administrative access to manipulate patient records, appointment schedules, billing information, and potentially access sensitive personal health information.
If Mitigated
With proper network segmentation and web application firewalls, the attack surface is reduced, but the vulnerability remains exploitable if the system is exposed.
🎯 Exploit Status
SQL injection on login pages is a well-understood attack vector with many available tools. The unauthenticated nature makes exploitation trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references
Vendor Advisory: https://www.twcert.org.tw/tw/cp-132-5509-80f05-1.html
Restart Required: Yes
Instructions:
1. Contact Le-yan software vendor for the security patch. 2. Apply the patch following vendor instructions. 3. Restart the application server. 4. Verify the fix by testing SQL injection attempts.
🔧 Temporary Workarounds
Web Application Firewall (WAF)
allDeploy a WAF with SQL injection rules to block malicious login attempts
Network Segmentation
allRestrict access to the dental management system to internal network only
🧯 If You Can't Patch
- Implement strong network segmentation to isolate the dental management system from untrusted networks
- Deploy a web application firewall with specific SQL injection detection rules for the login endpoint
🔍 How to Verify
Check if Vulnerable:
Test the login page with SQL injection payloads like ' OR '1'='1 in username/password fields and observe if authentication bypass occursCheck Version:
Check application version through system interface or contact vendor for version identificationVerify Fix Applied:
After patching, attempt the same SQL injection tests and verify they are rejected or properly sanitized📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts with SQL keywords (SELECT, UNION, OR, --)
- Successful admin login from unusual IP addresses
- Login attempts with special characters typically used in SQL injection
Network Indicators:
- Unusual traffic patterns to login endpoint
- Requests containing SQL injection patterns in POST data
SIEM Query:
source="web_logs" AND (uri="/login" OR uri="/auth") AND (message="*SELECT*" OR message="*UNION*" OR message="*OR '1'='1*")