CVE-2021-43130
📋 TL;DR
This CVE describes a critical SQL injection vulnerability in the Sourcecodester Customer Relationship Management System (CRM) version 1.0. Attackers can exploit this by injecting malicious SQL code through the username parameter in the login page, potentially allowing unauthorized access, data theft, or system compromise. Organizations using this specific CRM version are affected.
💻 Affected Systems
- Sourcecodester Customer Relationship Management System (CRM)
📦 What is this software?
Customer Relationship Management System by Customer Relationship Management System Project
View all CVEs affecting Customer Relationship Management System →
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the CRM database including theft of all customer data, financial records, and sensitive business information; potential for full system takeover and lateral movement within the network.
Likely Case
Unauthorized access to the CRM system, data exfiltration of customer information, and potential privilege escalation to administrative accounts.
If Mitigated
Limited impact with proper input validation and parameterized queries preventing SQL injection; authentication failures logged but no successful exploitation.
🎯 Exploit Status
Multiple public exploit scripts available; exploitation requires no authentication and minimal technical skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
1. Check for updated version from Sourcecodester
2. If no patch available, implement workarounds
3. Consider migrating to alternative CRM solution
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement server-side validation and sanitization of username parameter
Modify customer/login.php to use prepared statements with parameterized queries
Web Application Firewall (WAF)
allDeploy WAF with SQL injection protection rules
Configure WAF to block SQL injection patterns in login requests
🧯 If You Can't Patch
- Isolate the CRM system in a segmented network with strict access controls
- Implement strong authentication requirements and monitor login attempts
🔍 How to Verify
Check if Vulnerable:
Test login page with SQL injection payloads in username field (e.g., ' OR '1'='1)Check Version:
Check CRM version in admin panel or configuration filesVerify Fix Applied:
Attempt SQL injection after implementing parameterized queries; verify payloads are rejected📡 Detection & Monitoring
Log Indicators:
- Unusual SQL syntax in login attempts
- Multiple failed login attempts with SQL patterns
- Successful logins from unexpected IPs
Network Indicators:
- HTTP POST requests to customer/login.php containing SQL keywords
- Unusual database query patterns
SIEM Query:
source="web_logs" AND uri="/customer/login.php" AND (request CONTAINS "OR" OR request CONTAINS "UNION" OR request CONTAINS "SELECT")