CVE-2024-4238
📋 TL;DR
This critical vulnerability in Tenda AX1806 routers allows remote attackers to execute arbitrary code via a stack-based buffer overflow in the device name setting function. Attackers can exploit this without authentication to potentially take full control of affected routers. All users of Tenda AX1806 version 1.0.0.1 are affected.
💻 Affected Systems
- Tenda AX1806
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to internal networks, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point into internal networks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal exploitation risk remains.
🎯 Exploit Status
Detailed exploit documentation is publicly available on GitHub, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor did not respond to disclosure
Restart Required: Yes
Instructions:
No official patch available. Monitor Tenda's website for firmware updates and apply immediately when released.
🔧 Temporary Workarounds
Disable remote administration
allDisable WAN-side administration access to prevent external exploitation
Network segmentation
allIsolate Tenda routers in a separate VLAN with strict firewall rules
🧯 If You Can't Patch
- Replace affected devices with different models from vendors with better security response
- Implement strict network access controls to limit traffic to/from affected routers
🔍 How to Verify
Check if Vulnerable:
Check router web interface or CLI for firmware version. If version is 1.0.0.1, the device is vulnerable.Check Version:
Check router web interface at Status > Device Info or use telnet/SSH if availableVerify Fix Applied:
Verify firmware version has been updated to a version later than 1.0.0.1📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetOnlineDevName with long devName parameters
- Device reboots or configuration changes not initiated by administrators
Network Indicators:
- Unusual outbound connections from router to unknown IPs
- Traffic patterns suggesting device compromise
SIEM Query:
source_ip="router_ip" AND (url_path="/goform/SetOnlineDevName" OR (event_type="buffer_overflow" AND device_model="AX1806"))🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AX/AX1806/formSetDeviceName_devName.md
- https://vuldb.com/?ctiid.262129
- https://vuldb.com/?id.262129
- https://vuldb.com/?submit.319232
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AX/AX1806/formSetDeviceName_devName.md
- https://vuldb.com/?ctiid.262129
- https://vuldb.com/?id.262129
- https://vuldb.com/?submit.319232
