CVE-2019-7271
📋 TL;DR
Nortek Linear eMerge 50P/5000P access control systems have hardcoded default credentials that cannot be changed. This allows attackers to gain administrative access to physical security systems, potentially compromising building security. Organizations using these devices for door access control are affected.
💻 Affected Systems
- Nortek Linear eMerge 50P
- Nortek Linear eMerge 5000P
📦 What is this software?
Linear Emerge 5000p Firmware by Nortekcontrol
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full administrative control over physical access systems, unlock all doors, disable alarms, manipulate access logs, and potentially pivot to other network systems.
Likely Case
Unauthorized individuals gain building access, disable security features, or manipulate access logs to cover intrusions.
If Mitigated
Systems are isolated from networks, credentials are rotated where possible, and physical security monitoring detects unauthorized access attempts.
🎯 Exploit Status
Exploitation requires only knowledge of the default credentials and network access to the device.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Specific firmware updates from Nortek Linear
Vendor Advisory: https://www.nortekcontrol.com/
Restart Required: Yes
Instructions:
1. Contact Nortek Linear for updated firmware. 2. Backup current configuration. 3. Apply firmware update following vendor instructions. 4. Verify credentials can be changed post-update.
🔧 Temporary Workarounds
Network segmentation
allIsolate eMerge devices on separate VLAN with strict firewall rules
Access control restrictions
allImplement IP whitelisting and strong authentication for management interfaces
🧯 If You Can't Patch
- Physically isolate devices from all networks and manage locally only
- Implement 24/7 physical security monitoring and alerting for unauthorized access attempts
🔍 How to Verify
Check if Vulnerable:
Attempt to authenticate to the eMerge web interface using default credentials (varies by model, check vendor documentation)Check Version:
Check firmware version in device web interface or via serial consoleVerify Fix Applied:
After patching, verify that default credentials no longer work and that you can set custom administrative credentials📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful login with default credentials
- Configuration changes from unknown IP addresses
Network Indicators:
- Unusual traffic patterns to eMerge management ports
- Authentication requests from unexpected network segments
SIEM Query:
source="eMerge" AND (event_type="authentication" AND result="success" AND user="default_admin")