CVE-2024-4168
📋 TL;DR
This critical vulnerability in Tenda 4G300 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the sub_4260F0 function when manipulating the upfilen argument. Attackers can exploit this without authentication to potentially take full control of affected devices. All users running vulnerable firmware versions are affected.
💻 Affected Systems
- Tenda 4G300
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, network pivoting, and data exfiltration.
Likely Case
Remote code execution allowing attackers to modify device configuration, intercept network traffic, or use the device as part of a botnet.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal network compromise remains possible.
🎯 Exploit Status
Public GitHub repository contains technical details and likely proof-of-concept. The low complexity and remote unauthenticated nature make weaponization highly probable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor did not respond to disclosure
Restart Required: Yes
Instructions:
No official patch available. Monitor Tenda website for firmware updates. If update becomes available: 1. Download from official Tenda site 2. Log into router admin interface 3. Navigate to firmware upgrade section 4. Upload new firmware 5. Wait for reboot
🔧 Temporary Workarounds
Network Segmentation and Access Control
allIsolate affected routers from critical networks and restrict access to management interface
Firewall Rules
linuxBlock external access to router web interface (typically port 80/443)
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Replace affected devices with non-vulnerable alternatives
- Implement strict network segmentation to isolate vulnerable routers from critical assets
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status or Firmware Upgrade sectionCheck Version:
curl -s http://router-ip/status.cgi | grep version or check web interface manuallyVerify Fix Applied:
Verify firmware version is newer than 1.01.42. No specific test available due to lack of vendor patch.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to router management interface
- Large payloads in upfilen parameter
- Multiple failed exploit attempts
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting device compromise
- Exploit kit traffic targeting router IP
SIEM Query:
source="router_logs" AND (uri_path="/goform/setUpgradeFW" OR param="upfilen") AND data_size>1000🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/G3/4G300/sub_4260F0.md
- https://vuldb.com/?ctiid.261987
- https://vuldb.com/?id.261987
- https://vuldb.com/?submit.318987
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/G3/4G300/sub_4260F0.md
- https://vuldb.com/?ctiid.261987
- https://vuldb.com/?id.261987
- https://vuldb.com/?submit.318987
