CVE-2024-31813
📋 TL;DR
The TOTOLINK EX200 V4.0.3c.7646_B20201211 wireless range extender lacks any authentication mechanism by default, allowing unauthenticated attackers to access its management interface. This affects all users who have not manually configured authentication on their devices. Attackers can potentially take full control of the device or use it as an entry point into the network.
💻 Affected Systems
- TOTOLINK EX200
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to network compromise, credential theft, malware deployment, or use as a pivot point for lateral movement.
Likely Case
Unauthorized configuration changes, network disruption, or device being used for malicious traffic routing.
If Mitigated
Limited impact if authentication is properly configured and network segmentation is in place.
🎯 Exploit Status
Exploitation requires no authentication and minimal technical skill. Public proof-of-concept exists in GitHub repository.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Users must manually configure authentication in device settings.
🔧 Temporary Workarounds
Enable Authentication
allManually configure authentication in the device web interface
Access web interface at device IP > System > User Management > Set username and password
Network Isolation
allPlace device on isolated VLAN or network segment
🧯 If You Can't Patch
- Disconnect device from network immediately
- Replace with a different model that supports authentication
🔍 How to Verify
Check if Vulnerable:
Attempt to access device web interface without credentials. If access is granted, device is vulnerable.Check Version:
Check firmware version in web interface: System > Device InformationVerify Fix Applied:
Verify authentication is required when accessing web interface. Test with incorrect credentials should be rejected.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access attempts to device management interface
- Configuration changes without authentication logs
Network Indicators:
- Unusual traffic from device IP
- Unauthorized configuration requests to device
SIEM Query:
source_ip="device_ip" AND (http_method="POST" OR http_method="GET") AND url_contains="/cgi-bin/" AND NOT auth_success="true"