CVE-2024-4111
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda TX9 routers allows remote attackers to execute arbitrary code by manipulating the 'time' parameter in the SetLEDCfg function. This affects Tenda TX9 routers running firmware version 22.03.02.10. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda TX9
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, persistent backdoor installation, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept network traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal threats remain possible.
🎯 Exploit Status
Public exploit code is available, and the vulnerability requires no authentication, making exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Contact Tenda support for firmware updates and monitor their website for security advisories.
🔧 Temporary Workarounds
Block Web Interface Access
linuxRestrict access to the router's web management interface from untrusted networks.
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Remote Management
allTurn off remote management features in router settings if not required.
🧯 If You Can't Patch
- Isolate affected routers in a separate VLAN with strict network segmentation
- Implement network monitoring and intrusion detection for suspicious traffic to/from router IPs
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via web interface at http://router_ip/status.asp or via SSH if enabled.Check Version:
curl -s http://router_ip/status.asp | grep -i firmwareVerify Fix Applied:
Verify firmware version has been updated beyond 22.03.02.10, though no patch is currently available.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetLEDCfg with long 'time' parameters
- Multiple failed exploit attempts or buffer overflow patterns in web logs
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- Traffic spikes to router management interface from external IPs
SIEM Query:
source="router_logs" AND url="/goform/SetLEDCfg" AND (param_length>100 OR status_code=500)🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/TX9/SetLEDCfg.md
- https://vuldb.com/?ctiid.261854
- https://vuldb.com/?id.261854
- https://vuldb.com/?submit.317205
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/TX9/SetLEDCfg.md
- https://vuldb.com/?ctiid.261854
- https://vuldb.com/?id.261854
- https://vuldb.com/?submit.317205
