CVE-2023-49435
📋 TL;DR
Tenda AX9 routers running firmware version V22.03.01.46 contain a command injection vulnerability in the SetNetControlList function. This allows attackers to execute arbitrary commands on the device with root privileges. All users of affected routers are at risk.
💻 Affected Systems
- Tenda AX9
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover, persistent backdoor installation, credential theft, and pivot point for attacking internal networks.
Likely Case
Router compromise leading to DNS hijacking, traffic interception, credential harvesting, and botnet recruitment.
If Mitigated
Limited impact if device is behind firewall with no external access and strong network segmentation.
🎯 Exploit Status
Exploit requires authentication to the web interface. Public proof-of-concept demonstrates command injection via crafted HTTP requests.
🛠️ 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. 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 web management interface
Network Segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace affected device with patched or different model
- Implement strict firewall rules blocking all external access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin panel under System Status or System Tools > Firmware UpgradeCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is newer than V22.03.01.46📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed login attempts followed by successful login
- Suspicious POST requests to /goform/SetNetControlList
Network Indicators:
- Unusual outbound connections from router
- DNS queries to suspicious domains
- Traffic patterns indicating command-and-control communication
SIEM Query:
source="router.log" AND ("SetNetControlList" OR "command injection" OR suspicious shell commands)