CVE-2024-41630
📋 TL;DR
A stack-based buffer overflow vulnerability in Tenda AC18 routers allows remote attackers to execute arbitrary code by sending specially crafted requests to the ssid parameter. This affects Tenda AC18 routers running firmware version V15.03.3.10_EN, potentially giving attackers full control of the device.
💻 Affected Systems
- Tenda AC18
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, credential theft, network pivoting, and persistent backdoor installation.
Likely Case
Router takeover enabling DNS hijacking, traffic interception, credential harvesting, and botnet recruitment.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and strong network segmentation.
🎯 Exploit Status
Exploit details published in public references. No authentication required to trigger vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor downloads for updated firmware
Vendor Advisory: https://www.tendacn.com/hk/download/detail-3863.html
Restart Required: Yes
Instructions:
1. Download latest firmware from Tenda website. 2. Log into router admin interface. 3. Navigate to System Tools > Firmware Upgrade. 4. Upload and install new firmware. 5. Reboot router.
🔧 Temporary Workarounds
Disable Remote Management
allPrevent WAN access to router web interface
Network Segmentation
allIsolate router management interface to trusted network
🧯 If You Can't Patch
- Place router behind firewall with strict inbound rules blocking port 80/443
- Implement network monitoring for suspicious requests to /goform/fast_setting_wifi_set
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System StatusCheck Version:
Check via web interface or SSH if enabled: cat /proc/versionVerify Fix Applied:
Confirm firmware version is updated beyond V15.03.3.10_EN📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /goform/fast_setting_wifi_set with long ssid parameters
- Multiple failed login attempts followed by buffer overflow patterns
Network Indicators:
- HTTP requests with oversized ssid parameters (> typical 32 chars)
- Traffic to router management port from unexpected sources
SIEM Query:
source="router_logs" AND uri="/goform/fast_setting_wifi_set" AND (ssid_length>100 OR contains(ssid, shellcode_patterns))