CVE-2024-32318
📋 TL;DR
This vulnerability in Tenda AC500 routers allows remote attackers to execute arbitrary code via a stack overflow in the VLAN configuration function. Attackers can exploit this to take full control of affected devices. All users running the vulnerable firmware version are affected.
💻 Affected Systems
- Tenda AC500
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to persistent backdoor installation, network traffic interception, lateral movement to other devices, and botnet recruitment.
Likely Case
Remote code execution allowing attackers to modify router settings, intercept traffic, or use the device as a pivot point for further attacks.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and VLAN functionality is disabled.
🎯 Exploit Status
Exploitation requires authentication to the web interface. Public proof-of-concept code is available in GitHub repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. Download latest firmware for AC500
3. Access router web interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload and install new firmware
6. Reboot router
🔧 Temporary Workarounds
Disable VLAN functionality
allTurn off VLAN configuration in router settings to remove attack vector
Restrict web interface access
allLimit access to router management interface to trusted IP addresses only
🧯 If You Can't Patch
- Isolate affected routers in separate network segment with strict firewall rules
- Disable remote management and only allow local console access
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router web interface under System Status > Firmware VersionCheck Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version has been updated to a version newer than V2.0.1.9(1307)📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by VLAN configuration requests
- Unusual POST requests to /goform/setVlanInfo
Network Indicators:
- Unusual outbound connections from router
- Traffic patterns suggesting device compromise
SIEM Query:
source="router-logs" AND (uri="/goform/setVlanInfo" OR "vlan" AND "overflow")