CVE-2023-30135
📋 TL;DR
This CVE describes a command injection vulnerability in Tenda AC18 routers that allows attackers to execute arbitrary commands on the device. Attackers can exploit this by sending specially crafted requests to the vulnerable setUsbUnload function. This affects users running the vulnerable firmware version on Tenda AC18 routers.
💻 Affected Systems
- Tenda AC18
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing attackers to install persistent backdoors, intercept network traffic, pivot to internal networks, or brick the device.
Likely Case
Remote code execution leading to device takeover, credential theft, and network surveillance capabilities.
If Mitigated
Limited impact if device is behind strict firewall rules, not internet-facing, and network segmentation prevents lateral movement.
🎯 Exploit Status
The vulnerability is in a web interface function and requires no authentication. Public GitHub repository contains exploit details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda official website for firmware updates
2. Download latest firmware for AC18
3. Access router admin interface
4. Navigate to firmware upgrade section
5. Upload and apply new firmware
6. Reboot router after update
🔧 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 router with different model or vendor
- Implement strict firewall rules blocking all external access to router management ports
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface. If version matches v15.03.05.19(6318_)_cn, device is vulnerable.Check Version:
Check router web interface or use: curl -s http://router-ip/login/AuthVerify Fix Applied:
Verify firmware version has been updated to a newer version than v15.03.05.19(6318_)_cn📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to setUsbUnload endpoint
- Suspicious command execution in system logs
- Multiple failed login attempts followed by successful exploitation
Network Indicators:
- Unusual outbound connections from router
- Traffic to known malicious IPs from router
- Unexpected port openings on router
SIEM Query:
source="router_logs" AND (uri="/goform/setUsbUnload" OR command="*;*" OR command="*|*")