CVE-2023-4744
📋 TL;DR
This critical vulnerability in Tenda AC8 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the formSetDeviceName function. Attackers can exploit this without authentication to potentially take full control of affected devices. All users running the vulnerable firmware version are at risk.
💻 Affected Systems
- Tenda AC8
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access, though internal network exposure remains.
🎯 Exploit Status
Public exploit code is available on GitHub, making exploitation trivial for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates
2. If update available, download and flash via web interface
3. Factory reset after update to ensure clean state
4. Verify new firmware version is installed
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the vulnerable web interface
Access router web interface > Advanced > System Tools > Remote Management > Disable
Network segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace affected devices with patched or alternative models
- Implement strict firewall rules blocking all WAN access to router management interface (ports 80/443)
🔍 How to Verify
Check if Vulnerable:
Access router web interface > System Status > Firmware Version, check if version matches 16.03.34.06_cn_TDC01Check Version:
curl -s http://router-ip/status.cgi | grep firmware_versionVerify Fix Applied:
Verify firmware version has changed from vulnerable version after update📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to formSetDeviceName endpoint
- Multiple failed buffer overflow attempts
- Sudden configuration changes
Network Indicators:
- Unusual traffic patterns from router to external IPs
- Exploit payload patterns in HTTP requests
SIEM Query:
source="router_logs" AND (uri="/goform/setDeviceName" OR message="*formSetDeviceName*")