CVE-2024-33214
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Tenda FH1206 routers by exploiting a stack-based buffer overflow in the RouteStatic form handler. Attackers can send specially crafted requests to the vulnerable endpoint to potentially gain full control of affected devices. This affects all users running the vulnerable firmware version.
💻 Affected Systems
- Tenda FH1206
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, credential theft, and lateral movement to other network devices.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as part of a botnet.
If Mitigated
Denial of service or temporary disruption if exploit fails or is detected by security controls.
🎯 Exploit Status
The vulnerability is in a web form handler accessible without authentication. Public technical details exist, making weaponization straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. Download latest firmware for FH1206. 3. Log into router admin interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Block Web Interface Access
linuxRestrict access to router web interface from untrusted networks
iptables -A INPUT -p tcp --dport 80 -s ! 192.168.0.0/16 -j DROP
iptables -A INPUT -p tcp --dport 443 -s ! 192.168.0.0/16 -j DROP
Disable Remote Management
allTurn off remote management feature in router settings
🧯 If You Can't Patch
- Isolate router on separate VLAN with strict firewall rules
- Implement network monitoring for exploit attempts and anomalous traffic
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or System Tools > Firmware UpgradeCheck Version:
curl -s http://router-ip/ | grep -i 'firmware' || login to web interfaceVerify Fix Applied:
Verify firmware version is no longer V1.2.0.8(8155)_EN and test if /ip/goform/RouteStatic endpoint still accepts malformed entrys parameter📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /ip/goform/RouteStatic with unusually long entrys parameter
- Router reboot events or configuration changes
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting device compromise
SIEM Query:
source="router-logs" AND (url="/ip/goform/RouteStatic" AND entrys="*") | where length(entrys) > 100