CVE-2018-19240
📋 TL;DR
This CVE describes an unauthenticated buffer overflow vulnerability in the network.cgi component of TRENDnet IP cameras. Attackers can exploit it by sending a specially crafted POST request to hijack control flow and execute arbitrary code. Affected devices include TRENDnet TV-IP110WN and TV-IP121WN cameras running specific vulnerable firmware versions.
💻 Affected Systems
- TRENDnet TV-IP110WN
- TRENDnet TV-IP121WN
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing remote code execution, camera hijacking, lateral movement to internal networks, and persistent backdoor installation.
Likely Case
Remote code execution leading to camera control takeover, video stream interception, credential theft, and device integration into botnets.
If Mitigated
Limited impact if devices are isolated in separate VLANs with strict network segmentation and egress filtering.
🎯 Exploit Status
Exploit code is publicly available in Packet Storm and Full Disclosure archives. Attack requires only network access to device web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check TRENDnet website for latest firmware updates
Vendor Advisory: https://www.trendnet.com/support/
Restart Required: Yes
Instructions:
1. Visit TRENDnet support website. 2. Download latest firmware for your specific model. 3. Access camera web interface. 4. Navigate to Maintenance > Firmware Upgrade. 5. Upload firmware file. 6. Wait for automatic reboot.
🔧 Temporary Workarounds
Network Segmentation
allIsolate cameras in separate VLAN with strict firewall rules
Access Control
linuxBlock external access to camera web interface ports (typically 80/443)
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
🧯 If You Can't Patch
- Segment cameras into isolated network VLAN with no internet access
- Implement strict firewall rules to block all inbound traffic to camera web interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version in camera web interface under Maintenance > Firmware InformationCheck Version:
curl -s http://[CAMERA_IP]/cgi-bin/network.cgi | grep -i versionVerify Fix Applied:
Verify firmware version has been updated to a version not listed in affected versions📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /cgi-bin/network.cgi
- Large payloads in POST requests
- Multiple failed authentication attempts followed by successful POST
Network Indicators:
- POST requests to /cgi-bin/network.cgi with oversized payloads
- Unusual outbound connections from camera devices
- Traffic patterns inconsistent with normal camera operation
SIEM Query:
source="camera_logs" AND uri="/cgi-bin/network.cgi" AND method="POST" AND content_length>1000🔗 References
- http://packetstormsecurity.com/files/150693/TRENDnet-Command-Injection-Buffer-Overflow-Cross-Site-Scripting.html
- http://seclists.org/fulldisclosure/2018/Dec/21
- http://packetstormsecurity.com/files/150693/TRENDnet-Command-Injection-Buffer-Overflow-Cross-Site-Scripting.html
- http://seclists.org/fulldisclosure/2018/Dec/21
