CVE-2024-31807
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on TOTOLINK EX200 routers by sending specially crafted requests to the NTPSyncWithHost function. Attackers can take full control of affected devices without authentication. All users running vulnerable firmware versions are affected.
💻 Affected Systems
- TOTOLINK EX200
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to intercept network traffic, deploy malware to connected devices, pivot to internal networks, and establish persistent backdoors.
Likely Case
Router takeover leading to network monitoring, DNS hijacking, credential theft, and potential lateral movement to connected devices.
If Mitigated
Limited impact if device is behind firewall with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repository, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check TOTOLINK website for firmware updates. 2. Download latest firmware. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router administration interface
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Place router behind firewall with strict inbound filtering rules
- Implement network monitoring for suspicious traffic to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Upgrade sectionCheck Version:
Login to router web interface and navigate to System Status pageVerify Fix Applied:
Verify firmware version has been updated to a version later than V4.0.3c.7646_B20201211📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to NTPSyncWithHost endpoint
- Multiple failed login attempts followed by successful exploitation
Network Indicators:
- Unexpected outbound connections from router
- Suspicious traffic patterns to/from router management interface
SIEM Query:
source="router_logs" AND (uri="/cgi-bin/NTPSyncWithHost" OR method="POST" AND uri CONTAINS "NTPSyncWithHost")