CVE-2021-47706
📋 TL;DR
COMMAX Biometric Access Control System 1.0.0 contains an authentication bypass vulnerability that allows unauthenticated attackers to forge cookies and bypass authentication. This enables access to sensitive information and circumvention of physical controls in smart homes and buildings. Organizations using this specific version are affected.
💻 Affected Systems
- COMMAX Biometric Access Control System
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full administrative access to access control systems, disable security features, manipulate physical locks/gates, and steal sensitive biometric and personal data.
Likely Case
Unauthorized access to building systems, disclosure of resident/employee information, and potential physical security breaches.
If Mitigated
Limited to information disclosure if network segmentation prevents access to physical control interfaces.
🎯 Exploit Status
Exploit code is publicly available on Exploit-DB (ID 50206), making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.commax.com
Restart Required: No
Instructions:
No official patch available. Contact COMMAX support for guidance. Consider upgrading to a newer version if available.
🔧 Temporary Workarounds
Network Segmentation
allIsolate the access control system from untrusted networks and the internet.
Web Application Firewall
allDeploy a WAF with rules to detect and block cookie manipulation attempts.
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the system
- Monitor for unusual authentication patterns and cookie manipulation attempts
🔍 How to Verify
Check if Vulnerable:
Check if you're running COMMAX Biometric Access Control System version 1.0.0. Attempt to access protected endpoints with forged authentication cookies.Check Version:
Check system web interface or contact vendor for version informationVerify Fix Applied:
Verify system is no longer version 1.0.0 or test that cookie manipulation no longer bypasses authentication.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful access
- Unusual cookie values in HTTP requests
- Access from unauthorized IP addresses to protected endpoints
Network Indicators:
- HTTP requests with manipulated cookie parameters to authentication endpoints
- Traffic to access control interfaces from unexpected sources
SIEM Query:
source="web_logs" AND (uri CONTAINS "/admin" OR uri CONTAINS "/control") AND (cookie CONTAINS "auth_bypass" OR cookie LENGTH > normal)