CVE-2024-2763
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda AC10U routers allows remote attackers to execute arbitrary code by manipulating the funcpara1 parameter in the formSetCfm function. This affects Tenda AC10U routers running firmware version 15.03.06.48. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda AC10U
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, creation of persistent backdoors, lateral movement to internal networks, and botnet recruitment.
Likely Case
Device takeover enabling traffic interception, DNS hijacking, credential theft, and use as attack platform against internal networks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public exploit details available on GitHub. Remote exploitation requires no authentication. Simple buffer overflow with predictable exploitation path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor did not respond to disclosure
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates 2. If update available, download and upload via web interface 3. Factory reset recommended after update 4. Verify version after reboot
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router web interface
Access router admin panel → Advanced → System Tools → Remote Management → Disable
Network segmentation
allIsolate router management interface to trusted network
Configure firewall rules to restrict access to router IP on ports 80/443
🧯 If You Can't Patch
- Replace affected devices with patched or different vendor equipment
- Implement strict network segmentation with firewall rules blocking all inbound traffic to router management interface
🔍 How to Verify
Check if Vulnerable:
Access router web interface → System Status → Firmware Version → Check if version is 15.03.06.48Check Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interfaceVerify Fix Applied:
After firmware update, verify version is different from 15.03.06.48📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/setcfm with long funcpara1 parameters
- Multiple failed exploitation attempts
- Unexpected device reboots
Network Indicators:
- Traffic to router IP on port 80/443 with buffer overflow patterns
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND uri="/goform/setcfm" AND (param_length>100 OR contains(param,"funcpara1"))🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC10U/v1.V15.03.06.48/more/formSetCfm.md
- https://vuldb.com/?ctiid.257600
- https://vuldb.com/?id.257600
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC10U/v1.V15.03.06.48/more/formSetCfm.md
- https://vuldb.com/?ctiid.257600
- https://vuldb.com/?id.257600
