CVE-2021-39402
📋 TL;DR
MaianAffiliate v1.0 suffers from code injection vulnerability in the admin product addition feature. This allows attackers to inject malicious code that executes on the main affiliate page, affecting both authenticated and unauthenticated visitors. The vulnerability enables arbitrary code execution through the web interface.
💻 Affected Systems
- MaianAffiliate
📦 What is this software?
Maianaffiliate by Maianmedia
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through remote code execution, data theft, defacement, and installation of backdoors or malware.
Likely Case
Website defacement, credential theft via XSS, affiliate data manipulation, and potential privilege escalation.
If Mitigated
Limited impact with proper input validation and output encoding, potentially only minor data exposure.
🎯 Exploit Status
Exploit requires admin credentials initially, but payload execution affects all users. Public proof-of-concept available on GitHub.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.maianscriptworld.co.uk/
Restart Required: No
Instructions:
No official patch available. Consider upgrading to newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation and output encoding for product addition fields
Implement server-side validation: filter_var($input, FILTER_SANITIZE_STRING);
Use htmlspecialchars() for output encoding
WAF Rule Implementation
allDeploy web application firewall rules to block code injection attempts
ModSecurity rule: SecRule ARGS "@rx (<script|javascript:|on\w+=)" "id:1001,phase:2,deny"
🧯 If You Can't Patch
- Restrict admin panel access to trusted IP addresses only
- Implement Content Security Policy (CSP) headers to prevent script execution
🔍 How to Verify
Check if Vulnerable:
Check if running MaianAffiliate v1.0. Test by adding product with payload like <script>alert('test')</script> and visiting affiliate page.Check Version:
Check version in admin panel or readme files. Look for 'MaianAffiliate v1.0' in source code.Verify Fix Applied:
Verify input validation prevents script tags and special characters in product fields. Test payload execution fails.📡 Detection & Monitoring
Log Indicators:
- Unusual product additions with script tags or encoded payloads
- Multiple failed login attempts to admin panel followed by product creation
Network Indicators:
- HTTP POST requests to admin/product-add.php with suspicious payloads
- Outbound connections from web server to unknown IPs
SIEM Query:
source="web_logs" AND (uri="/admin/product-add.php" AND (body CONTAINS "<script>" OR body CONTAINS "javascript:"))