CVE-2024-41459
📋 TL;DR
CVE-2024-41459 is a critical stack-based buffer overflow vulnerability in Tenda FH1201 routers that allows remote attackers to execute arbitrary code by sending specially crafted requests to the PPPOEPassword parameter. This affects all users running Tenda FH1201 v1.2.0.14 firmware who have the vulnerable web interface accessible.
💻 Affected Systems
- Tenda FH1201
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to connected devices, and potential botnet recruitment.
Likely Case
Remote code execution allowing attacker to modify router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if the web interface is not internet-facing and network segmentation prevents lateral movement.
🎯 Exploit Status
Public proof-of-concept available in GitHub repository. Exploitation requires sending a crafted HTTP POST request to the vulnerable endpoint.
🛠️ 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 for FH1201. 3. Access router web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router web interface
Network Segmentation
allIsolate router management interface to trusted network
🧯 If You Can't Patch
- Replace affected router with different model or vendor
- Implement strict firewall rules to block access to router web interface from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface (System Status > Firmware Version) or by accessing http://[router-ip]/goform/getStatusCheck Version:
curl -s http://[router-ip]/goform/getStatus | grep -i versionVerify Fix Applied:
Verify firmware version is no longer v1.2.0.14 and test if the vulnerable endpoint still accepts malformed PPPOEPassword input📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/QuickIndex with long PPPOEPassword parameters
- Multiple failed authentication attempts followed by successful exploit
Network Indicators:
- HTTP POST requests to router IP on port 80/443 with unusually long parameter values
- Sudden outbound connections from router to unknown IPs
SIEM Query:
source="router_logs" AND uri="/goform/QuickIndex" AND (param_length>100 OR status_code=500)