CVE-2024-55959
📋 TL;DR
CVE-2024-55959 is an insecure permissions vulnerability in Northern.tech Mender Client that allows local users to escalate privileges or modify system files. This affects all systems running Mender Client 4.x before version 4.0.5 for device management and IoT deployments.
💻 Affected Systems
- Northern.tech Mender Client
⚠️ 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
Full system compromise through privilege escalation to root, allowing attackers to install malware, exfiltrate data, or disrupt device operations.
Likely Case
Local privilege escalation allowing unauthorized access to sensitive files, configuration modification, or service disruption.
If Mitigated
Limited impact with proper access controls, but still presents security risk requiring patching.
🎯 Exploit Status
Requires local access to the system but exploitation is straightforward once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.0.5
Vendor Advisory: https://mender.io/blog/cve-2024-55959
Restart Required: Yes
Instructions:
1. Update Mender Client to version 4.0.5 or later using your package manager. 2. Restart the Mender service. 3. Verify the update was successful.
🔧 Temporary Workarounds
Restrict local access
linuxLimit local user access to systems running Mender Client
File permission hardening
linuxManually review and tighten permissions on Mender-related files and directories
chmod 600 /var/lib/mender/*
chown root:root /var/lib/mender/*
🧯 If You Can't Patch
- Implement strict access controls to prevent unauthorized local access to affected systems
- Monitor for suspicious file permission changes or privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Mender Client version: mender --version or dpkg -l | grep mender-clientCheck Version:
mender --version 2>/dev/null || dpkg -l | grep mender-client || rpm -qa | grep mender-clientVerify Fix Applied:
Confirm version is 4.0.5 or higher and verify file permissions are properly set📡 Detection & Monitoring
Log Indicators:
- Unauthorized permission changes to Mender files
- Unexpected privilege escalation attempts
- Failed authentication attempts followed by successful local access
Network Indicators:
- Unusual outbound connections from Mender-managed devices
SIEM Query:
source="mender.log" AND ("permission denied" OR "access violation" OR "unauthorized")