CVE-2024-36475
📋 TL;DR
This vulnerability in Century Systems' FutureNet NXR, VXR, and WXR series allows authenticated users with debug function knowledge to execute arbitrary OS commands via active debug code. It affects organizations using these network devices, potentially leading to full system compromise.
💻 Affected Systems
- FutureNet NXR series
- FutureNet VXR series
- FutureNet WXR series
📦 What is this software?
Futurenet Nxr 125\/cx Firmware by Centurysys
Futurenet Nxr 160\/lw Firmware by Centurysys
Futurenet Nxr G180\/l Ca Firmware by Centurysys
Futurenet Vxr X64 by Centurysys
Futurenet Vxr X86 by Centurysys
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover, data exfiltration, lateral movement within network, and persistent backdoor installation.
Likely Case
Unauthorized command execution leading to configuration changes, service disruption, or credential harvesting.
If Mitigated
Limited impact if debug functions are disabled and access is restricted to trusted administrators only.
🎯 Exploit Status
Exploitation requires authentication but debug function usage is straightforward for knowledgeable users
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patches released July 16, 2024
Vendor Advisory: https://www.centurysys.co.jp/backnumber/nxr_common/20240716-01.html
Restart Required: Yes
Instructions:
1. Download firmware update from Century Systems website. 2. Backup current configuration. 3. Apply firmware update via device management interface. 4. Reboot device. 5. Verify debug functions are disabled.
🔧 Temporary Workarounds
Disable Debug Functions
allDisable all debug functionality in device configuration
Configure via device management interface: Disable debug mode and remove debug user accounts
Restrict Administrative Access
allLimit device management access to trusted IP addresses only
Configure access control lists to restrict management interface access
🧯 If You Can't Patch
- Isolate affected devices in separate network segments with strict firewall rules
- Implement multi-factor authentication for all administrative access
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against patched versions listed in vendor advisoryCheck Version:
Check via device web interface or CLI: show versionVerify Fix Applied:
Verify firmware version is updated and debug functions are disabled in configuration📡 Detection & Monitoring
Log Indicators:
- Debug mode activation logs
- Unusual command execution patterns
- Authentication from unexpected sources
Network Indicators:
- Unexpected outbound connections from devices
- Anomalous traffic patterns from management interfaces
SIEM Query:
source="device_logs" AND (event="debug_mode" OR command="system" OR command="shell")🔗 References
- https://jvn.jp/en/vu/JVNVU96424864/
- https://www.centurysys.co.jp/backnumber/nxr_common/20240716-01.html
- https://www.centurysys.co.jp/backnumber/nxr_common/20240716-03.html
- https://jvn.jp/en/vu/JVNVU96424864/
- https://www.centurysys.co.jp/backnumber/nxr_common/20240716-01.html
- https://www.centurysys.co.jp/backnumber/nxr_common/20240716-03.html
