CVE-2023-51102
📋 TL;DR
CVE-2023-51102 is a critical stack overflow vulnerability in Tenda W9 routers that allows remote attackers to execute arbitrary code or cause denial of service. The vulnerability exists in the formWifiMacFilterSet function and affects users of Tenda W9 routers with firmware version V1.0.0.7(4456)_CN.
💻 Affected Systems
- Tenda W9
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, and lateral movement to connected networks.
Likely Case
Router crash causing denial of service, requiring physical reset and disrupting network connectivity.
If Mitigated
Limited impact if device is behind firewall with restricted administrative access and network segmentation.
🎯 Exploit Status
Public GitHub repository contains detailed analysis and proof-of-concept. Exploitation requires network access to the router's web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Check Tenda official website for firmware updates
2. If update available, download and flash via web interface
3. Factory reset after update to clear potential compromises
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Network Segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace affected router with different model or vendor
- Place router behind dedicated firewall with strict access controls
🔍 How to Verify
Check if Vulnerable:
Check router web interface for firmware version. If version is V1.0.0.7(4456)_CN, device is vulnerable.Check Version:
Connect to router web interface and navigate to System Status or About page.Verify Fix Applied:
Verify firmware version has changed from V1.0.0.7(4456)_CN to a newer version.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to formWifiMacFilterSet endpoint
- Router crash/reboot logs
- Memory corruption errors in system logs
Network Indicators:
- Unusual traffic to router management port (typically 80/443)
- Large payloads sent to formWifiMacFilterSet endpoint
SIEM Query:
source="router_logs" AND ("formWifiMacFilterSet" OR "stack overflow" OR "segmentation fault")