CVE-2021-38840
📋 TL;DR
This vulnerability allows attackers to execute arbitrary SQL commands via the username parameter in the login system of Simple Water Refilling Station Management System 1.0. This affects all installations of this specific software version that are exposed to untrusted input. Attackers can potentially bypass authentication, access sensitive data, or compromise the entire database.
💻 Affected Systems
- Simple Water Refilling Station Management System
📦 What is this software?
Simple Water Refilling Station Management System by Simple Water Refilling Station Management System Project
View all CVEs affecting Simple Water Refilling Station Management System →
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including data theft, data manipulation, and potential remote code execution through database functions.
Likely Case
Authentication bypass leading to unauthorized system access, followed by data extraction and potential privilege escalation.
If Mitigated
Limited impact with proper input validation and parameterized queries in place.
🎯 Exploit Status
Multiple public exploits exist. Exploitation requires no authentication and uses simple SQL injection techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Replace vulnerable code with parameterized queries or migrate to a different system.
🔧 Temporary Workarounds
Implement Input Validation
allAdd server-side validation to sanitize username input before processing.
Modify water_refilling/classes/Login.php to validate username parameter
Web Application Firewall
allDeploy WAF with SQL injection rules to block malicious requests.
🧯 If You Can't Patch
- Isolate the system behind a firewall with strict access controls
- Implement network segmentation to limit database access
🔍 How to Verify
Check if Vulnerable:
Test login form with SQL injection payloads like ' OR '1'='1 in username fieldCheck Version:
Check software version in system configuration or about pageVerify Fix Applied:
Verify that SQL injection payloads no longer bypass authentication or return database errors📡 Detection & Monitoring
Log Indicators:
- Unusual SQL syntax in login attempts
- Multiple failed login attempts with SQL patterns
Network Indicators:
- HTTP POST requests to login endpoint containing SQL keywords
SIEM Query:
source="web_logs" AND (uri="/water_refilling/classes/Login.php" OR uri LIKE "%login%") AND (request_body LIKE "%OR%" OR request_body LIKE "%UNION%" OR request_body LIKE "%SELECT%")🔗 References
- https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-38840
- https://www.exploit-db.com/exploits/50204
- https://www.exploit-db.com/exploits/50205
- https://www.sourcecodester.com/php/14906/simple-water-refilling-station-management-system-php-free-source-code.html
- https://www.sourcecodester.com/users/tips23
- https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-38840
- https://www.exploit-db.com/exploits/50204
- https://www.exploit-db.com/exploits/50205
- https://www.sourcecodester.com/php/14906/simple-water-refilling-station-management-system-php-free-source-code.html
- https://www.sourcecodester.com/users/tips23
