CVE-2019-11417
📋 TL;DR
This CVE describes a buffer overflow vulnerability in TRENDnet TV-IP110WN IP cameras that allows remote attackers to execute arbitrary code. The vulnerability exists in the system.cgi web interface where the 'languse' parameter lacks proper length validation before a strcpy operation. Affected users include anyone using TRENDnet TV-IP110WN cameras with vulnerable firmware versions.
💻 Affected Systems
- TRENDnet TV-IP110WN IP Camera
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, camera control takeover, network pivoting, and persistent backdoor installation.
Likely Case
Remote code execution allowing attackers to disable cameras, exfiltrate video feeds, or use the device as a foothold in the network.
If Mitigated
Denial of service if exploit fails or limited impact if device is isolated with proper network segmentation.
🎯 Exploit Status
The exploit requires sending a specially crafted HTTP request with a long languse parameter to the system.cgi endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check TRENDnet for updated firmware
Vendor Advisory: https://www.trendnet.com/support/
Restart Required: Yes
Instructions:
1. Visit TRENDnet support site 2. Download latest firmware for TV-IP110WN 3. Upload via web interface 4. Reboot camera
🔧 Temporary Workarounds
Network Segmentation
allIsolate camera network from critical systems and internet
Access Control
linuxRestrict web interface access to trusted IPs only
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
🧯 If You Can't Patch
- Disable remote web access and use only local network management
- Replace vulnerable cameras with updated models or different vendors
🔍 How to Verify
Check if Vulnerable:
Check firmware version in camera web interface under System > InformationCheck Version:
curl -s http://CAMERA_IP/cgi/system.cgi | grep versionVerify Fix Applied:
Verify firmware version is updated beyond affected builds and test with known exploit payloads📡 Detection & Monitoring
Log Indicators:
- HTTP requests to system.cgi with unusually long languse parameters
- Multiple failed login attempts followed by system.cgi access
Network Indicators:
- HTTP POST requests to /cgi/system.cgi with payload length > 1000 bytes
- Unusual outbound connections from camera IP
SIEM Query:
source="web_logs" AND uri="/cgi/system.cgi" AND (languse.length>1000 OR languse CONTAINS shellcode_patterns)