CVE-2023-49431
📋 TL;DR
This CVE describes a command injection vulnerability in Tenda AX9 routers that allows attackers to execute arbitrary commands on the device. The vulnerability exists in the 'mac' parameter of the /goform/SetOnlineDevName endpoint. Anyone using affected Tenda AX9 router versions is potentially vulnerable.
💻 Affected Systems
- Tenda AX9
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, intercept all network traffic, pivot to internal networks, or brick the device.
Likely Case
Remote code execution leading to device takeover, network traffic monitoring, and potential lateral movement to connected devices.
If Mitigated
Limited impact if proper network segmentation, firewall rules, and access controls prevent external exploitation.
🎯 Exploit Status
Public proof-of-concept exists in GitHub repositories. The vulnerability is straightforward to exploit with basic web request manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates. 2. Download the latest firmware for AX9. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply the new firmware. 6. Reboot the router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router administration interface
Network Segmentation
allIsolate router management interface to trusted network segments only
🧯 If You Can't Patch
- Replace affected router with a different model or vendor
- Implement strict firewall rules blocking access to port 80/443 on the router from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. If version is V22.03.01.46, the device is vulnerable.Check Version:
Access router web interface at http://[router-ip] and check System Status or Firmware Version pageVerify Fix Applied:
Verify firmware version has been updated to a version later than V22.03.01.46📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetOnlineDevName
- Commands containing shell metacharacters in URL parameters
- Unexpected system command execution in router logs
Network Indicators:
- HTTP requests to router with shell commands in parameters
- Unusual outbound connections from router to external IPs
SIEM Query:
http.url:*goform/SetOnlineDevName* AND (http.param:*;* OR http.param:*|* OR http.param:*`* OR http.param:*$(*)