CVE-2024-31815
📋 TL;DR
This vulnerability allows unauthenticated attackers to download the configuration file from TOTOLINK EX200 routers via a specific CGI script. This exposes sensitive router configuration data including credentials and network settings. All users running the affected firmware version are vulnerable.
💻 Affected Systems
- TOTOLINK EX200
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers obtain administrative credentials, gain full control of the router, pivot to internal networks, intercept/modify traffic, and deploy persistent malware.
Likely Case
Attackers extract Wi-Fi passwords, admin credentials, and network topology information to conduct further attacks or sell the information.
If Mitigated
With proper network segmentation and monitoring, impact is limited to the router itself, though credentials would still be compromised.
🎯 Exploit Status
Exploitation requires only a single HTTP GET request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch available. Check TOTOLINK website for firmware updates. If update exists: 1. Download latest firmware from vendor site 2. Log into router admin interface 3. Navigate to firmware update section 4. Upload and apply new firmware 5. Verify version after reboot.
🔧 Temporary Workarounds
Block CGI Script Access
linuxUse firewall rules to block access to /cgi-bin/ExportSettings.sh endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/cgi-bin/ExportSettings.sh" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/cgi-bin/ExportSettings.sh" --algo bm -j DROP
Disable Web Interface
allDisable router web management interface if not needed
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules limiting access
- Implement network monitoring for requests to /cgi-bin/ExportSettings.sh endpoint
🔍 How to Verify
Check if Vulnerable:
curl -v http://[router-ip]/cgi-bin/ExportSettings.sh - if it returns configuration data, device is vulnerableCheck Version:
Check router web interface admin page or use: curl -s http://[router-ip]/ | grep -i versionVerify Fix Applied:
After applying workaround, same curl command should be blocked or return error📡 Detection & Monitoring
Log Indicators:
- HTTP GET requests to /cgi-bin/ExportSettings.sh
- Large configuration file downloads from router
Network Indicators:
- Unusual outbound traffic from router after configuration access
- Multiple failed login attempts following configuration download
SIEM Query:
source="router_logs" AND uri="/cgi-bin/ExportSettings.sh"