CVE-2023-49047
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda AX1803 routers by exploiting a stack overflow in the device name setting function. Attackers can send specially crafted requests to trigger the overflow, potentially gaining full control of affected devices. All users running vulnerable firmware versions are affected.
💻 Affected Systems
- Tenda AX1803
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, credential theft, and use as pivot point for attacking other internal systems.
Likely Case
Router compromise allowing attackers to modify network settings, intercept traffic, deploy malware to connected devices, or join botnets for DDoS attacks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal attackers could still exploit if they gain network access.
🎯 Exploit Status
Detailed technical analysis and proof-of-concept available in public repositories. Exploitation requires sending crafted HTTP request to web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda support website for firmware updates
2. Download latest firmware for AX1803
3. Log into router web interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload and install new firmware
6. Reboot router after installation
🔧 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 device with different model/brand
- Place router behind dedicated firewall with strict inbound rules
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status > Firmware VersionCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version is no longer v1.0.0.1 after update📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/setDeviceName
- Multiple failed authentication attempts followed by device name change requests
- Router reboot logs after suspicious requests
Network Indicators:
- HTTP POST requests to router IP with long devName parameter
- Unusual outbound connections from router after exploitation
SIEM Query:
source="router_logs" AND (uri="/goform/setDeviceName" OR method="POST" AND uri CONTAINS "setDeviceName")