CVE-2024-8228
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda O5 routers allows remote attackers to execute arbitrary code by manipulating parameters in the MAC filter configuration function. This affects Tenda O5 router firmware version 1.0.0.8(5017) and potentially other versions. Attackers can exploit this without authentication to potentially take full control of affected routers.
💻 Affected Systems
- Tenda O5 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete router compromise, allowing attackers to intercept network traffic, deploy malware to connected devices, or use the router as a pivot point into internal networks.
Likely Case
Router compromise leading to network traffic interception, DNS hijacking, or deployment of botnet malware on the router itself.
If Mitigated
Limited impact if routers are behind firewalls with strict inbound filtering, though internal attacks remain possible.
🎯 Exploit Status
Exploit details are publicly available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.tenda.com.cn/
Restart Required: No
Instructions:
No official patch is available. Check Tenda's website for firmware updates. If an update becomes available, download it from the official site and apply via the router's web interface.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the router's web interface
Access router web interface > Advanced Settings > Remote Management > Disable
Block vulnerable endpoint
linuxUse firewall rules to block access to the vulnerable /goform/setMacFilterList endpoint
iptables -A INPUT -p tcp --dport 80 -m string --string "/goform/setMacFilterList" --algo bm -j DROP
iptables -A INPUT -p tcp --dport 443 -m string --string "/goform/setMacFilterList" --algo bm -j DROP
🧯 If You Can't Patch
- Replace affected Tenda O5 routers with different models from vendors that provide security updates
- Place routers behind dedicated firewalls with strict inbound filtering and intrusion prevention systems
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface: Login > System Status > Firmware Version. If version is 1.0.0.8(5017) or similar, assume vulnerable.Check Version:
curl -s http://router-ip/ | grep -i firmware || ssh admin@router-ip 'cat /etc/version'Verify Fix Applied:
Verify firmware version has changed from 1.0.0.8(5017) after update. Test if /goform/setMacFilterList endpoint still accepts malicious input.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/setMacFilterList with long parameter values
- Router crash/reboot logs following web interface access
Network Indicators:
- Unusual outbound connections from router IP
- Traffic patterns suggesting router compromise (DNS changes, unexpected proxies)
SIEM Query:
source="router_logs" AND (url="/goform/setMacFilterList" AND (param_length>100 OR status_code=500))