CVE-2021-38833
📋 TL;DR
This CVE describes a SQL injection vulnerability in PHPGurukul Apartment Visitors Management System v1.0 that allows attackers to execute arbitrary SQL statements. Successful exploitation can lead to remote code execution, potentially compromising the entire system. Organizations using this specific software version are affected.
💻 Affected Systems
- PHPGurukul Apartment Visitors Management System (AVMS)
📦 What is this software?
Apartment Visitors Management System by Apartment Visitors Management System Project
View all CVEs affecting Apartment Visitors Management System →
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full administrative access, data exfiltration, and persistent backdoor installation.
Likely Case
Database compromise leading to data theft, privilege escalation, and potential RCE through database functions.
If Mitigated
Limited impact with proper input validation and database permissions restricting damage to specific tables.
🎯 Exploit Status
Multiple public exploit scripts available. Exploitation requires no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Remove the vulnerable software immediately. 2. Replace with alternative visitor management solution. 3. No official patch exists from vendor.
🔧 Temporary Workarounds
Input Validation Implementation
allAdd parameterized queries and input validation to all user inputs
Implement prepared statements in PHP: $stmt = $conn->prepare('SELECT * FROM users WHERE id = ?'); $stmt->bind_param('i', $id);
Web Application Firewall
linuxDeploy WAF with SQL injection rules to block exploitation attempts
Install and configure ModSecurity with OWASP CRS rules
🧯 If You Can't Patch
- Isolate the system from internet access and restrict to internal network only
- Implement strict network segmentation and monitor all database queries
🔍 How to Verify
Check if Vulnerable:
Check if running PHPGurukul AVMS v1.0 by examining source code or admin panel versionCheck Version:
Check PHP files for version information or examine admin panel footerVerify Fix Applied:
Test SQL injection payloads against user inputs to confirm they're properly sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual SQL syntax in web server logs
- Multiple failed login attempts with SQL payloads
- Unexpected database queries from web application
Network Indicators:
- SQL keywords in HTTP POST/GET parameters
- Unusual outbound database connections
SIEM Query:
source="web_server" AND ("UNION SELECT" OR "SELECT * FROM" OR "information_schema" OR "xp_cmdshell")🔗 References
- https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-38833
- https://phpgurukul.com/apartment-visitors-management-system-using-php-and-mysql/
- https://streamable.com/ojobew
- https://www.exploit-db.com/exploits/50288
- https://github.com/nu11secur1ty/CVE-mitre/tree/main/CVE-2021-38833
- https://phpgurukul.com/apartment-visitors-management-system-using-php-and-mysql/
- https://streamable.com/ojobew
- https://www.exploit-db.com/exploits/50288
