CVE-2024-34943
📋 TL;DR
CVE-2024-34943 is a critical stack-based buffer overflow vulnerability in Tenda FH1206 routers that allows remote attackers to execute arbitrary code by sending specially crafted requests to the ip/goform/NatStaticSetting endpoint. This affects all users running vulnerable firmware versions, potentially giving attackers full control of affected devices.
💻 Affected Systems
- Tenda FH1206
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Remote code execution allowing attackers to install malware, create botnet nodes, or disrupt network connectivity for affected devices.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation prevents lateral movement.
🎯 Exploit Status
Public technical details available in references; exploitation appears straightforward with buffer overflow via page parameter manipulation.
🛠️ 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. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Network Access Control
linuxBlock external access to router administration interface
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Vulnerable Feature
allDisable NAT static setting functionality if not required
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict firewall rules
- Implement network monitoring for suspicious traffic to router administration ports
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or Firmware Upgrade sectionCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version has changed from V1.2.0.8(8155)_EN to a newer version📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/NatStaticSetting
- Multiple failed buffer overflow attempts in system logs
Network Indicators:
- Unusual traffic patterns to router administration interface from external IPs
- POST requests with abnormally long page parameter values
SIEM Query:
source="router_logs" AND (uri="/goform/NatStaticSetting" OR message="buffer overflow")