CVE-2023-51090
📋 TL;DR
CVE-2023-51090 is a critical stack overflow vulnerability in Tenda M3 routers that allows remote attackers to execute arbitrary code by sending specially crafted requests to the formGetWeiXinConfig function. This affects all users running Tenda M3 V1.0.0.12(4856) firmware. Successful exploitation could lead to complete device compromise.
💻 Affected Systems
- Tenda M3
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full router compromise, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Router takeover allowing attackers to intercept network traffic, modify DNS settings, and launch attacks against internal devices.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. Exploitation requires sending crafted HTTP requests to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download latest firmware for M3 model. 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
- Replace affected Tenda M3 routers with different models from other vendors
- Implement strict firewall rules to block all external access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is V1.0.0.12(4856), device is vulnerable.Check Version:
Access router web interface at http://192.168.0.1 or http://192.168.1.1 and check System Status or Firmware Version pageVerify Fix Applied:
Verify firmware version has been updated to a version later than V1.0.0.12(4856)📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to router management interface
- Multiple failed authentication attempts followed by successful access
- Unexpected firmware modification logs
Network Indicators:
- Unusual outbound connections from router
- DNS hijacking patterns
- Traffic redirection to suspicious IPs
SIEM Query:
source="router_logs" AND (uri="/goform/GetWeiXinConfig" OR uri="/goform/formGetWeiXinConfig") AND method="POST"