CVE-2024-4065
📋 TL;DR
This critical vulnerability in Tenda AC8 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the reboot timer function. Attackers can exploit this without authentication to potentially take full control of affected devices. All users running vulnerable firmware versions are at risk.
💻 Affected Systems
- Tenda AC8
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing persistent backdoor installation, network traffic interception, and lateral movement to other devices on the network.
Likely Case
Remote code execution leading to device takeover, botnet enrollment, or credential theft from connected devices.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering and network segmentation.
🎯 Exploit Status
Public exploit details are available on GitHub. The vulnerability requires no authentication and has straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates. 2. If update available, download and install via web interface. 3. Factory reset after update. 4. Reconfigure settings securely.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the vulnerable web interface
Access router admin panel -> System -> Remote Management -> Disable
Network segmentation
allIsolate router management interface from untrusted networks
Configure firewall rules to block external access to port 80/443 on router
🧯 If You Can't Patch
- Replace affected devices with supported models from different vendors
- Deploy network-based intrusion prevention systems to detect and block exploit attempts
🔍 How to Verify
Check if Vulnerable:
Access router web interface, navigate to System Status page and check firmware version matches 16.03.34.09Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
After firmware update, verify version is different from 16.03.34.09 and test that /goform/SetRebootTimer endpoint rejects malformed input📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetRebootTimer
- Multiple failed buffer overflow attempts in web logs
- Unexpected device reboots
Network Indicators:
- HTTP POST requests with unusually long rebootTime parameters
- Traffic to router management interface from unexpected sources
SIEM Query:
source="router_logs" AND uri="/goform/SetRebootTimer" AND content_length>100🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC8/formSetRebootTimer.md
- https://vuldb.com/?ctiid.261791
- https://vuldb.com/?id.261791
- https://vuldb.com/?submit.316494
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC8/formSetRebootTimer.md
- https://vuldb.com/?ctiid.261791
- https://vuldb.com/?id.261791
- https://vuldb.com/?submit.316494
