CVE-2023-46060
📋 TL;DR
A buffer overflow vulnerability in Tenda AC500 routers allows remote attackers to cause denial of service by sending specially crafted requests to the setVlanInfo component. This affects Tenda AC500 routers running firmware version 2.0.1.9. Attackers can exploit this without authentication to crash the device.
💻 Affected Systems
- Tenda AC500
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, persistent backdoor installation, and network infiltration.
Likely Case
Denial of service causing router reboot or crash, disrupting network connectivity for all connected devices.
If Mitigated
Limited to denial of service with no persistent impact if device auto-recovers after reboot.
🎯 Exploit Status
Public proof-of-concept demonstrates exploitation via simple HTTP POST request. No authentication required.
🛠️ 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. 3. Access router admin interface. 4. Navigate to firmware upgrade section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Block External Access
linuxConfigure firewall to block external access to router web interface on port 80/443.
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disable Remote Management
allDisable remote management feature in router settings to prevent external exploitation.
🧯 If You Can't Patch
- Isolate affected routers in separate network segment with strict access controls
- Implement network monitoring for exploitation attempts and anomalous traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check router firmware version via admin interface. If version is 2.0.1.9, device is vulnerable.Check Version:
curl -s http://router-ip/goform/getStatus | grep versionVerify Fix Applied:
Verify firmware version has been updated to a version later than 2.0.1.9.📡 Detection & Monitoring
Log Indicators:
- Multiple POST requests to /goform/setVlanInfo
- Router crash/reboot events in system logs
- Unusual port parameter values in web logs
Network Indicators:
- HTTP POST requests to /goform/setVlanInfo with malformed port parameter
- Sudden loss of connectivity to router management interface
SIEM Query:
source="router_logs" AND uri_path="/goform/setVlanInfo" AND method="POST"