CVE-2021-47708
📋 TL;DR
This SQL injection vulnerability in the COMMAX Smart Home System CDP-1020n allows attackers to bypass authentication by injecting malicious SQL code through the 'id' parameter. Attackers can gain unauthorized access to the smart home control system. This affects users of the vulnerable COMMAX CDP-1020n device.
💻 Affected Systems
- COMMAX Smart Home System CDP-1020n
⚠️ 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
Complete system compromise allowing attackers to control smart home devices, access sensitive user data, and potentially pivot to other network systems.
Likely Case
Unauthorized access to the smart home control panel allowing manipulation of connected IoT devices and viewing of user information.
If Mitigated
Limited impact with proper network segmentation and authentication controls in place.
🎯 Exploit Status
Exploit code is publicly available on Exploit-DB (ID 50207). The vulnerability requires no authentication and has simple exploitation steps.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.commax.com
Restart Required: No
Instructions:
1. Check COMMAX website for security advisories
2. Contact COMMAX support for patch availability
3. Apply firmware updates if available
4. Verify the fix by testing the vulnerability
🔧 Temporary Workarounds
Network Segmentation
allIsolate the COMMAX device from internet and restrict access to trusted networks only
Web Application Firewall
allDeploy WAF rules to block SQL injection patterns targeting loginstart.asp
WAF rule: Block requests containing SQL injection patterns in 'id' parameter to loginstart.asp
🧯 If You Can't Patch
- Disable remote access and only allow local network access to the device
- Implement strong network monitoring and alerting for suspicious authentication attempts
🔍 How to Verify
Check if Vulnerable:
Send POST request to loginstart.asp with SQL injection payload in 'id' parameter and check if authentication bypass occursCheck Version:
Check device web interface or contact COMMAX support for firmware version informationVerify Fix Applied:
Test the same SQL injection payload after applying fixes to confirm authentication now fails properly📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts
- SQL error messages in web logs
- Multiple failed login attempts followed by successful login from same IP
Network Indicators:
- POST requests to loginstart.asp with unusual 'id' parameter values
- SQL keywords in HTTP POST parameters
SIEM Query:
source="web_logs" AND uri="*loginstart.asp*" AND (param="*id=*' OR *" OR param="*id=* UNION *" OR param="*id=* SELECT *")