CVE-2020-22172
📋 TL;DR
CVE-2020-22172 is a SQL injection vulnerability in PHPGurukul Hospital Management System v4.0 that allows remote unauthenticated attackers to execute arbitrary SQL commands through the get_doctor.php endpoint. This enables attackers to extract sensitive database information including patient records, medical data, and system credentials. All deployments of PHPGurukul Hospital Management System version 4.0 are affected.
💻 Affected Systems
- PHPGurukul Hospital Management System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to exposure of all patient medical records, personal information, and administrative credentials, potentially enabling full system takeover and data exfiltration.
Likely Case
Extraction of sensitive patient data and system credentials, leading to privacy violations and potential lateral movement within the network.
If Mitigated
Limited or no data exposure if proper input validation and parameterized queries are implemented, with database access restricted to necessary privileges.
🎯 Exploit Status
Public exploit code is available on GitHub, making this easily exploitable by attackers with basic SQL injection knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
1. Check for official updates from PHPGurukul
2. If no patch available, implement workarounds
3. Consider migrating to alternative software if maintenance has been abandoned
🔧 Temporary Workarounds
Input Validation and Sanitization
allAdd proper input validation and parameterized queries to get_doctor.php to prevent SQL injection
Edit hms/get_doctor.php to replace raw SQL with prepared statements using mysqli or PDO
Web Application Firewall (WAF)
allDeploy a WAF with SQL injection protection rules to block exploit attempts
Configure WAF rules to block SQL injection patterns in GET/POST parameters
🧯 If You Can't Patch
- Isolate the system behind a firewall and restrict access to trusted IP addresses only
- Implement network segmentation to limit database access from the web application server
🔍 How to Verify
Check if Vulnerable:
Test the /hms/get_doctor.php endpoint with SQL injection payloads (e.g., ' OR '1'='1) and observe if database errors or unexpected data is returnedCheck Version:
Check the system's version information in the admin panel or look for version markers in the source codeVerify Fix Applied:
Attempt the same SQL injection tests after applying fixes; successful fixes should return proper error messages or no data rather than executing SQL commands📡 Detection & Monitoring
Log Indicators:
- Unusual SQL error messages in web server logs
- Multiple requests to get_doctor.php with SQL-like patterns
- Database connection errors from web application
Network Indicators:
- HTTP requests containing SQL keywords (SELECT, UNION, etc.) to get_doctor.php
- Unusual database query patterns from web server IP
SIEM Query:
source="web_logs" AND uri="/hms/get_doctor.php" AND (request CONTAINS "UNION" OR request CONTAINS "SELECT" OR request CONTAINS "' OR '")