CVE-2024-4243
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda W9 routers allows remote attackers to execute arbitrary code by manipulating the ssidIndex parameter. This affects Tenda W9 router users running firmware version 1.0.0.7(4456). Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda W9
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistence installation, network pivoting, and data exfiltration.
Likely Case
Router takeover enabling man-in-the-middle attacks, DNS hijacking, credential theft, and botnet recruitment.
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. CVSS 8.8 indicates high exploitability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Vendor was contacted but did not respond. Consider replacing affected devices or implementing workarounds.
🔧 Temporary Workarounds
Disable Remote Management
allTurn off WAN-side access to router administration interface
Network Segmentation
allIsolate Tenda W9 routers in separate VLAN with strict firewall rules
🧯 If You Can't Patch
- Replace affected Tenda W9 routers with supported models from different vendors
- Implement strict network access controls to limit exposure to only trusted internal networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at 192.168.0.1 or 192.168.1.1, login and navigate to System Status or About pageCheck Version:
curl -s http://router-ip/goform/getStatus | grep version or check web interface manuallyVerify Fix Applied:
Verify firmware version is no longer 1.0.0.7(4456) - but no patched version exists📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/wifiSSIDset with manipulated ssidIndex parameters
- Multiple failed exploitation attempts
- Router reboot events following exploitation
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- DNS queries to suspicious domains from router
- Port scanning originating from router
SIEM Query:
source="router_logs" AND (uri="/goform/wifiSSIDset" OR uri="*wifiSSIDset*") AND (param="ssidIndex" OR param="*ssidIndex*")🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/W9/formwrlSSIDset.md
- https://vuldb.com/?ctiid.262134
- https://vuldb.com/?id.262134
- https://vuldb.com/?submit.319825
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/W9/formwrlSSIDset.md
- https://vuldb.com/?ctiid.262134
- https://vuldb.com/?id.262134
- https://vuldb.com/?submit.319825
