CVE-2023-37715
📋 TL;DR
This vulnerability is a stack overflow in Tenda F1202 and FH1202 routers that allows remote code execution. Attackers can exploit it by sending specially crafted requests to the vulnerable frmL7ProtForm function. Users of affected router models with vulnerable firmware versions are at risk.
💻 Affected Systems
- Tenda F1202
- Tenda FH1202
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, and lateral movement to connected devices.
Likely Case
Router takeover enabling DNS hijacking, credential theft, and botnet recruitment.
If Mitigated
Limited impact if routers are behind firewalls with strict inbound filtering and regular firmware updates.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repository. Exploitation requires network access to router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware for your model. 3. Log into router admin panel. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Network Segmentation
allIsolate router management interface to trusted network
🧯 If You Can't Patch
- Replace affected routers with supported models
- Implement strict firewall rules blocking all inbound traffic to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin panel under System Status or Firmware Upgrade sectionCheck Version:
Login to router web interface and navigate to System Status pageVerify Fix Applied:
Verify firmware version is newer than affected versions listed above📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/frmL7ProtForm
- Unusual process execution in router logs
- Failed authentication attempts followed by exploitation
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Traffic patterns indicating command and control
SIEM Query:
source="router_logs" AND (uri="/goform/frmL7ProtForm" OR process="exploit")