CVE-2024-51211
📋 TL;DR
This SQL injection vulnerability in OS4ED openSIS-Classic allows attackers to execute arbitrary SQL commands by manipulating the $username_stn_id parameter in resetuserinfo.php. Successful exploitation could lead to data theft, modification, or deletion. All users running openSIS-Classic Version 9.1 are affected.
💻 Affected Systems
- OS4ED openSIS-Classic
📦 What is this software?
Opensis by Os4ed
Opensis by Os4ed
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including sensitive student/personnel data exfiltration, authentication bypass, remote code execution via database functions, and system takeover.
Likely Case
Unauthorized access to student records, grade manipulation, personal information theft, and potential privilege escalation within the application.
If Mitigated
Limited impact with proper input validation, parameterized queries, and database user privilege restrictions in place.
🎯 Exploit Status
SQL injection vulnerabilities are commonly weaponized. The public GitHub repository contains proof-of-concept details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Check OS4ED website for security updates
2. Apply any available patches
3. Verify the fix by testing the vulnerable parameter
4. No service restart should be required for PHP file updates
🔧 Temporary Workarounds
Input Validation and Sanitization
allAdd proper input validation and parameterized queries to resetuserinfo.php
Modify resetuserinfo.php to use prepared statements:
$stmt = $db->prepare('SELECT * FROM users WHERE username_stn_id = ?');
$stmt->bind_param('s', $username_stn_id);
$stmt->execute();
File Access Restriction
allRestrict access to resetuserinfo.php via web server configuration
Apache: Add to .htaccess:
<Files "resetuserinfo.php">
Order Deny,Allow
Deny from all
</Files>
Nginx: Add to server block:
location ~ /resetuserinfo\.php$ {
deny all;
return 403;
}
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) with SQL injection rules
- Restrict database user permissions to minimum required privileges
🔍 How to Verify
Check if Vulnerable:
Test the resetuserinfo.php endpoint with SQL injection payloads like: ' OR '1'='1 in the username_stn_id parameterCheck Version:
Check openSIS version in admin panel or review installation files for version markersVerify Fix Applied:
Attempt SQL injection after applying fixes; successful payloads should return errors or be blocked📡 Detection & Monitoring
Log Indicators:
- Unusual SQL error messages in PHP/application logs
- Multiple failed login attempts followed by SQL syntax in requests
- Requests to resetuserinfo.php with special characters like quotes, semicolons, or SQL keywords
Network Indicators:
- HTTP POST/GET requests to resetuserinfo.php containing SQL injection patterns
- Unusual database query patterns from web server IP
SIEM Query:
source="web_logs" AND uri="*resetuserinfo.php*" AND (query="*' OR*" OR query="*;--*" OR query="*UNION*" OR query="*SELECT*" OR query="*INSERT*" OR query="*UPDATE*")