CVE-2023-37701
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda FH1203 routers by exploiting a stack overflow in the addWifiMacFilter function. Attackers can gain full control of affected devices by sending specially crafted requests containing malicious deviceId parameters. This affects all users running vulnerable firmware versions of Tenda FH1203 routers.
💻 Affected Systems
- Tenda FH1203
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to router compromise, credential theft, network traffic interception, and lateral movement to connected devices.
Likely Case
Remote code execution allowing attackers to install malware, create backdoors, or join the device to a botnet.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and not exposed to the internet.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. The vulnerability requires no authentication and has a straightforward exploitation path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for FH1203. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to the router's web interface
Log into router admin > Advanced > System Tools > Remote Management > Disable
Network Segmentation
allIsolate the router management interface from untrusted networks
Configure firewall rules to block external access to port 80/443 on router IP
🧯 If You Can't Patch
- Replace affected routers with different models from vendors with better security track records
- Place routers behind dedicated firewalls with strict inbound filtering rules
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under System Status or System Tools > Firmware UpgradeCheck Version:
curl -s http://router-ip/status.asp | grep firmware_versionVerify Fix Applied:
Verify firmware version has been updated to a version later than V2.0.1.6📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/addWifiMacFilter
- Multiple failed exploitation attempts
- Sudden configuration changes
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting device compromise
- Exploitation attempts against router management interface
SIEM Query:
source="router_logs" AND (uri="/goform/addWifiMacFilter" OR deviceId="*[long_string]*")