CVE-2024-2485
📋 TL;DR
A critical stack-based buffer overflow vulnerability in Tenda AC18 routers allows remote attackers to execute arbitrary code by manipulating the speed_dir parameter in the formSetSpeedWan function. This affects Tenda AC18 routers running firmware version 15.03.05.05. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda AC18
📦 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 or if vulnerable interfaces are not exposed.
🎯 Exploit Status
Public exploit code is available in GitHub repositories, making exploitation straightforward for attackers with basic skills.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available - vendor did not respond to disclosure
Restart Required: No
Instructions:
No official patch available. Consider replacing affected devices or implementing workarounds.
🔧 Temporary Workarounds
Disable Remote Management
allDisable remote access to the router's web management interface to prevent external exploitation.
Access router admin panel -> Advanced Settings -> System Tools -> Remote Management -> Disable
Network Segmentation
allPlace affected routers in isolated network segments with strict firewall rules.
🧯 If You Can't Patch
- Replace affected Tenda AC18 routers with devices from vendors that provide security updates
- Implement strict network access controls to limit exposure of the router's management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin panel: Login -> Advanced Settings -> System Status -> Firmware VersionCheck Version:
Check web interface or use: curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
No official fix available to verify. Workarounds can be verified by confirming remote management is disabled and firewall rules are in place.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/SetSpeedWan
- Multiple failed buffer overflow attempts
- Unexpected process crashes or restarts
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting device compromise
- Exploit kit traffic targeting router IPs
SIEM Query:
source="router_logs" AND (uri="/goform/SetSpeedWan" OR message="buffer overflow" OR message="segmentation fault")🔗 References
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC18/SetSpeedWan.md
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC18/setUsbUnload.md
- https://vuldb.com/?ctiid.256892
- https://vuldb.com/?id.256892
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC18/SetSpeedWan.md
- https://github.com/abcdefg-png/IoT-vulnerable/blob/main/Tenda/AC18/setUsbUnload.md
- https://vuldb.com/?ctiid.256892
- https://vuldb.com/?id.256892
