CVE-2024-4241
📋 TL;DR
This critical vulnerability in Tenda W9 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the formQosManageDouble_auto function. Attackers can exploit this by manipulating the ssidIndex argument, potentially gaining full control of affected devices. Users of Tenda W9 routers with firmware version 1.0.0.7(4456) are affected.
💻 Affected Systems
- Tenda W9
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, and lateral movement to other network devices.
Likely Case
Router takeover allowing traffic interception, credential theft, and use as pivot point for further attacks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and proper network segmentation.
🎯 Exploit Status
Public proof-of-concept available on GitHub. Remote exploitation without authentication makes this easily weaponizable.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
No official patch available. Vendor did not respond to disclosure. Consider replacing affected devices or implementing workarounds.
🔧 Temporary Workarounds
Disable remote management
allTurn off WAN access to router administration interface
Access router admin panel > Advanced Settings > Remote Management > Disable
Network segmentation
allIsolate router management interface to separate VLAN
🧯 If You Can't Patch
- Replace affected Tenda W9 routers with different models from vendors with better security track record
- Place router behind dedicated firewall with strict inbound rules blocking all unnecessary ports
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is exactly 1.0.0.7(4456), device is vulnerable.Check Version:
Login to router admin interface and check Firmware Version under System StatusVerify Fix Applied:
No official fix available to verify. If using workarounds, test that remote management is disabled and router responds only to expected traffic.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to formQosManageDouble_auto endpoint
- Multiple failed buffer overflow attempts in router logs
- Sudden configuration changes without administrator action
Network Indicators:
- Unusual traffic patterns from router to external IPs
- Router initiating unexpected outbound connections
- Port scans originating from router
SIEM Query:
source="router_logs" AND (uri="*formQosManageDouble_auto*" OR message="*buffer overflow*" OR message="*segmentation fault*")🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/W9/formQosManageDouble_user.md
- https://vuldb.com/?ctiid.262132
- https://vuldb.com/?id.262132
- https://vuldb.com/?submit.319823
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/W9/formQosManageDouble_user.md
- https://vuldb.com/?ctiid.262132
- https://vuldb.com/?id.262132
- https://vuldb.com/?submit.319823
