CVE-2021-37807
📋 TL;DR
This SQL injection vulnerability in Online Shopping Portal 3.1 allows attackers to execute arbitrary SQL commands via the email parameter in the /check_availability.php endpoint. This affects all users running the vulnerable version of the software, potentially exposing database contents and system access.
💻 Affected Systems
- Online Shopping Portal
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including user credentials, payment information, and administrative access leading to full system takeover.
Likely Case
Data exfiltration of user information, potential privilege escalation, and database manipulation.
If Mitigated
Limited impact with proper input validation and parameterized queries preventing SQL injection.
🎯 Exploit Status
Public exploit details available on Packet Storm. 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:
1. Check vendor website for updated version
2. If no patch available, implement workarounds
3. Replace vulnerable code with parameterized queries
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation for email parameter to reject SQL injection attempts
Modify check_availability.php to validate email format and sanitize input
Web Application Firewall (WAF)
allDeploy WAF rules to block SQL injection patterns
Configure WAF to block requests containing SQL keywords in email parameter
🧯 If You Can't Patch
- Implement network segmentation to isolate the vulnerable system
- Deploy intrusion detection systems to monitor for SQL injection attempts
🔍 How to Verify
Check if Vulnerable:
Test the /check_availability.php endpoint with SQL injection payloads in email parameter (e.g., ' OR '1'='1)Check Version:
Check application version in admin panel or source code commentsVerify Fix Applied:
Test with same payloads after fix - should return proper validation errors instead of SQL errors📡 Detection & Monitoring
Log Indicators:
- Unusual SQL errors in application logs
- Multiple failed email validation attempts with SQL keywords
Network Indicators:
- HTTP requests to /check_availability.php containing SQL injection patterns
SIEM Query:
source="web_logs" AND uri="/check_availability.php" AND (email CONTAINS "OR" OR email CONTAINS "UNION" OR email CONTAINS "SELECT")