CVE-2024-9441
📋 TL;DR
CVE-2024-9441 is a critical OS command injection vulnerability in Linear eMerge e3-Series access control systems. Remote unauthenticated attackers can execute arbitrary operating system commands via the forgot_password functionality, potentially gaining full system control. All systems running affected versions are vulnerable.
💻 Affected Systems
- Linear eMerge e3-Series
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install malware, steal credentials, pivot to internal networks, disable physical access controls, or cause physical damage.
Likely Case
Attackers gain shell access to install backdoors, exfiltrate sensitive data, or use the system as a foothold for lateral movement within the network.
If Mitigated
If network segmentation and strict firewall rules are in place, impact may be limited to the access control system itself without network pivoting.
🎯 Exploit Status
Exploitation requires only HTTP requests to the vulnerable endpoint with crafted login_id parameter. Public exploit code is available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.00-08 or later
Vendor Advisory: https://www.nortekcontrol.com/security-advisory/
Restart Required: Yes
Instructions:
1. Contact Linear/Nortek for patch version 1.00-08 or later. 2. Backup system configuration. 3. Apply the firmware update following vendor instructions. 4. Restart the system. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Segmentation
allIsolate eMerge systems from internet and restrict internal network access
Disable HTTP Access
allConfigure firewall to block HTTP access to eMerge systems, use HTTPS only if supported
🧯 If You Can't Patch
- Immediately isolate affected systems from internet and restrict network access to only necessary management IPs
- Implement strict network monitoring and IDS/IPS rules to detect and block exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check system firmware version via web interface or SSH. If version is 1.00-07 or earlier, system is vulnerable.Check Version:
Check via web interface at System > About or via SSH: cat /etc/versionVerify Fix Applied:
Verify firmware version is 1.00-08 or later. Test forgot_password functionality with safe input to ensure command injection is prevented.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST requests to forgot_password endpoint
- Suspicious commands in web server logs
- Failed login attempts followed by forgot_password requests
Network Indicators:
- HTTP POST requests to /forgot_password with shell metacharacters in parameters
- Outbound connections from eMerge system to unexpected destinations
SIEM Query:
source="web_logs" AND uri_path="/forgot_password" AND (param="login_id" AND value MATCHES "[;&|`$()]+")