CVE-2019-14698
📋 TL;DR
A buffer overflow vulnerability in MicroDigital N-series camera firmware allows remote attackers to execute arbitrary code by sending specially crafted HTTP requests to a CGI program. This affects cameras running firmware versions up to 6400.0.8.5, enabling complete system compromise.
💻 Affected Systems
- MicroDigital N-series cameras
📦 What is this software?
Mdc N2190v Firmware by Microdigital
Mdc N4090 Firmware by Microdigital
Mdc N4090w Firmware by Microdigital
⚠️ Risk & Real-World Impact
Worst Case
Full remote code execution leading to camera compromise, lateral movement to other devices, persistent backdoor installation, and surveillance data exfiltration.
Likely Case
Remote attackers gain shell access with nobody user privileges, allowing them to modify camera settings, disable security features, or use the device as a pivot point.
If Mitigated
With proper network segmentation and access controls, impact is limited to the camera device itself without lateral movement capabilities.
🎯 Exploit Status
Exploit details are publicly available on pastebin. The vulnerability requires no authentication and has a straightforward exploitation path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://www.microdigital.co.kr/
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates
2. If update available, download and verify checksum
3. Upload firmware through camera web interface
4. Reboot camera after update completion
🔧 Temporary Workarounds
Network Segmentation
allIsolate cameras on separate VLAN with strict firewall rules
Access Control
linuxRestrict HTTP access to camera web interface 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 interface access entirely
- Replace vulnerable cameras with patched models from different vendors
🔍 How to Verify
Check if Vulnerable:
Check firmware version in camera web interface under System > Information. If version is 6400.0.8.5 or lower, device is vulnerable.Check Version:
curl -s http://camera-ip/cgi-bin/getinfo.cgi | grep firmwareVerify Fix Applied:
Verify firmware version is above 6400.0.8.5 after update. Test with known exploit payloads to confirm mitigation.📡 Detection & Monitoring
Log Indicators:
- Unusual CGI program execution
- Large param values in HTTP requests
- Buffer overflow error messages in system logs
Network Indicators:
- HTTP requests with abnormally long param values to CGI endpoints
- Shell connection attempts from camera IP
SIEM Query:
source="camera_logs" AND (param_length>1000 OR "buffer overflow" OR "segmentation fault")