CVE-2021-41511
📋 TL;DR
This CVE describes an SQL injection vulnerability in the Lodging Reservation Management System V1 login functionality. Attackers can bypass authentication by injecting malicious SQL into username/password fields, gaining unauthorized access as any user. Organizations using this specific reservation system are affected.
💻 Affected Systems
- Lodging Reservation Management System
📦 What is this software?
Lodging Reservation Management System by Lodging Reservation Management System Project
View all CVEs affecting Lodging Reservation Management System →
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to access all reservation data, modify bookings, steal customer PII, and potentially pivot to other systems.
Likely Case
Unauthorized access to the reservation system leading to data theft, booking manipulation, and potential privilege escalation within the application.
If Mitigated
Limited impact with proper input validation and WAF rules blocking SQL injection attempts, though authentication bypass may still occur if vulnerabilities exist.
🎯 Exploit Status
Multiple public exploit scripts and demonstration videos are available showing authentication bypass via SQL injection payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider migrating to a supported, secure alternative system or implementing custom fixes with parameterized queries.
🔧 Temporary Workarounds
Implement Input Validation
allAdd server-side validation to reject SQL injection patterns in login fields
Custom implementation required - no standard commands
Web Application Firewall Rules
allDeploy WAF rules to block SQL injection attempts at the login endpoint
WAF-specific configuration required
🧯 If You Can't Patch
- Isolate the system behind a firewall with strict access controls
- Implement network segmentation to limit potential lateral movement
🔍 How to Verify
Check if Vulnerable:
Test login with SQL injection payloads like ' OR '1'='1 in username/password fieldsCheck Version:
Check system documentation or admin panel for version informationVerify Fix Applied:
Attempt SQL injection attacks after implementing fixes - successful login should be blocked📡 Detection & Monitoring
Log Indicators:
- Failed login attempts with SQL keywords
- Successful logins from unusual IPs
- Login attempts with special characters
Network Indicators:
- HTTP POST requests to login endpoint containing SQL syntax
- Unusual authentication patterns
SIEM Query:
source="web_logs" AND (uri="/login" OR uri="/auth") AND (message LIKE "%OR%" OR message LIKE "%UNION%" OR message LIKE "%SELECT%")🔗 References
- http://packetstormsecurity.com/files/164366/Lodging-Reservation-Management-System-1.0-SQL-Injection.html
- https://github.com/Ni7inSharma/CVE-2021-41511
- https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-41511
- https://streamable.com/9fq8uw
- https://www.exploit-db.com/exploits/50372
- https://www.nu11secur1ty.com/2021/10/cve-2021-41511.html
- https://www.sourcecodester.com/php/14883/lodging-reservation-management-system-php-free-source-code.html
- http://packetstormsecurity.com/files/164366/Lodging-Reservation-Management-System-1.0-SQL-Injection.html
- https://github.com/Ni7inSharma/CVE-2021-41511
- https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-41511
- https://streamable.com/9fq8uw
- https://www.exploit-db.com/exploits/50372
- https://www.nu11secur1ty.com/2021/10/cve-2021-41511.html
- https://www.sourcecodester.com/php/14883/lodging-reservation-management-system-php-free-source-code.html
