CVE-2024-40415
📋 TL;DR
A stack-based buffer overflow vulnerability in Tenda AX1806 router firmware allows remote attackers to execute arbitrary code or cause denial of service. This affects users of Tenda AX1806 routers with vulnerable firmware versions. Attackers can exploit this without authentication to potentially take full control of affected devices.
💻 Affected Systems
- Tenda AX1806
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, lateral movement to internal networks, and persistent backdoor installation.
Likely Case
Router crash/reboot causing denial of service, or limited code execution to modify router settings.
If Mitigated
Denial of service only if exploit fails or is blocked by network controls.
🎯 Exploit Status
Public proof-of-concept code exists in GitHub repositories. The vulnerability requires sending crafted HTTP requests to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. Download latest firmware for AX1806
3. Access router admin interface
4. Navigate to firmware upgrade section
5. Upload and install new firmware
6. Reboot router after installation
🔧 Temporary Workarounds
Disable Remote Management
allPrevent external access to router management interface
Network Segmentation
allIsolate router management interface to trusted network segment
🧯 If You Can't Patch
- Replace affected devices with patched or different model routers
- Implement strict network access controls to limit access to router management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version is 1.0.0.1, device is vulnerable.Check Version:
Check via router web interface at http://router_ip or using telnet/ssh if enabledVerify Fix Applied:
Verify firmware version has been updated to a version later than 1.0.0.1📡 Detection & Monitoring
Log Indicators:
- Multiple HTTP POST requests to /goform/SetStaticRouteCfg with large payloads
- Router crash/reboot logs
- Unusual process execution in router logs
Network Indicators:
- HTTP traffic to router IP on port 80/443 with POST to /goform/SetStaticRouteCfg
- Unusual outbound connections from router
SIEM Query:
source="router_logs" AND (uri="/goform/SetStaticRouteCfg" OR message="crash" OR message="reboot")