CVE-2024-33182
📋 TL;DR
This CVE describes a critical stack-based buffer overflow vulnerability in Tenda AC18 routers. Attackers can exploit this by sending specially crafted requests to the addWifiMacFilter endpoint, potentially allowing remote code execution. All users running the affected firmware version are vulnerable.
💻 Affected Systems
- Tenda AC18
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote unauthenticated attacker gains full control of the router, enabling network traffic interception, credential theft, and lateral movement into connected networks.
Likely Case
Remote code execution leading to router compromise, allowing attackers to modify network settings, intercept traffic, or use the device as a foothold for further attacks.
If Mitigated
With proper network segmentation and firewall rules, impact could be limited to the router itself without allowing access to internal systems.
🎯 Exploit Status
The vulnerability is in a web endpoint and requires no authentication, making exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda's official website for firmware updates
2. Download the latest firmware for AC18
3. Access router admin interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload and install the new firmware
6. Reboot the router
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to the router's web interface
Block access to vulnerable endpoint
allUse firewall rules to block access to /ip/goform/addWifiMacFilter
🧯 If You Can't Patch
- Isolate the router in a separate network segment
- Implement strict firewall rules to limit access to the router's management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status or System ToolsCheck Version:
Check via web interface or SSH if enabled: cat /etc/versionVerify Fix Applied:
Verify firmware version has been updated to a version newer than V15.03.3.10_EN📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /ip/goform/addWifiMacFilter with long deviceId parameters
- Router crash or reboot logs
Network Indicators:
- Unusual traffic patterns to router management interface
- Exploit payloads in HTTP requests
SIEM Query:
http.url:"/ip/goform/addWifiMacFilter" AND http.method:POST AND http.request_body_length > 1000