CVE-2020-18544
📋 TL;DR
CVE-2020-18544 is a critical SQL injection vulnerability in WMS v1.0 that allows remote attackers to execute arbitrary SQL commands via the username parameter in chkuser.php. This can lead to authentication bypass, data theft, and remote code execution. Any organization running WMS v1.0 with internet-facing login functionality is affected.
💻 Affected Systems
- WMS (Warehouse Management System)
📦 What is this software?
Wms by Wms Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise including remote code execution, database exfiltration, and lateral movement within the network
Likely Case
Authentication bypass leading to unauthorized access, data theft, and potential privilege escalation
If Mitigated
Limited impact with proper input validation and parameterized queries preventing SQL injection
🎯 Exploit Status
Simple SQL injection with public proof-of-concept available in GitHub issues
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider migrating to supported version or implementing workarounds.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation and parameterized queries for username parameter
Modify chkuser.php to use prepared statements: $stmt = $conn->prepare('SELECT * FROM users WHERE username = ?'); $stmt->bind_param('s', $username);
Web Application Firewall (WAF)
allDeploy WAF with SQL injection protection rules
🧯 If You Can't Patch
- Isolate WMS system in separate network segment with strict access controls
- Implement network-based intrusion detection to monitor for SQL injection attempts
🔍 How to Verify
Check if Vulnerable:
Test username parameter with SQL injection payloads like ' OR '1'='1Check Version:
Check WMS version in configuration files 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 username fields
- Multiple failed login attempts with SQL characters
- Database error messages in application logs
Network Indicators:
- HTTP POST requests to chkuser.php with SQL injection patterns
- Unusual database query patterns
SIEM Query:
source="web_logs" AND (uri="/chkuser.php" AND (username CONTAINS "'" OR username CONTAINS "--" OR username CONTAINS "#"))