CVE-2025-49603
📋 TL;DR
This vulnerability allows unauthorized access to device groups in Northern.tech Mender Server due to improper access control. Attackers can potentially modify device group assignments, affecting organizations using vulnerable Mender Server versions for IoT device management.
💻 Affected Systems
- Northern.tech Mender Server
⚠️ 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
Attackers could reassign devices to malicious groups, deploy unauthorized software updates, or disrupt device management operations across the entire IoT fleet.
Likely Case
Unauthorized users gain access to modify device group configurations, potentially leading to incorrect software deployments or device misconfigurations.
If Mitigated
With proper network segmentation and authentication controls, impact is limited to unauthorized group modifications within the Mender management interface.
🎯 Exploit Status
Exploitation requires some level of access to the Mender Server interface but bypasses intended access controls.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Mender Server 3.7.11 or 4.0.1
Vendor Advisory: https://mender.io/blog/cve-2025-49603-improper-access-control-of-device-groups-in-mender-server
Restart Required: Yes
Instructions:
1. Backup current Mender Server configuration and database. 2. Update to Mender Server 3.7.11 (for 3.x branch) or 4.0.1 (for 4.x branch). 3. Restart Mender Server services. 4. Verify device group access controls are functioning correctly.
🔧 Temporary Workarounds
Restrict Network Access
linuxLimit access to Mender Server management interface to trusted IP addresses only
# Example using iptables: iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP_RANGE -j ACCEPT
# iptables -A INPUT -p tcp --dport 443 -j DROP
Temporary Role Restrictions
allTemporarily restrict user roles to minimize potential damage from unauthorized access
# Review and adjust user permissions in Mender Server
# Consider temporarily removing group modification permissions from non-admin users
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Mender Server from untrusted networks
- Enable detailed audit logging for all device group modification activities
🔍 How to Verify
Check if Vulnerable:
Check Mender Server version via web interface or API. Vulnerable if version is below 3.7.11 (for 3.x) or below 4.0.1 (for 4.x).Check Version:
curl -k https://MENDER_SERVER/api/management/v1/system_info 2>/dev/null | grep -o '"version":"[^"]*"'Verify Fix Applied:
After patching, test that only authorized users can modify device group assignments according to their roles.📡 Detection & Monitoring
Log Indicators:
- Unauthorized device group modification attempts
- Unexpected changes to device-group assignments
- Access from unauthorized user accounts to group management endpoints
Network Indicators:
- Unusual API calls to device group management endpoints
- Traffic patterns suggesting enumeration of device groups
SIEM Query:
source="mender-server" AND (event="device_group_modified" OR endpoint="/api/management/v1/deployments/device-groups") AND user NOT IN ["admin", "authorized_users"]