CVE-2023-45465
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Netis N3Mv2 routers by injecting malicious code into the ddnsDomainName parameter in Dynamic DNS settings. Attackers can gain full control of affected devices, potentially compromising entire networks. All users of Netis N3Mv2-V1.0.1.865 routers with Dynamic DNS enabled are affected.
💻 Affected Systems
- Netis N3Mv2 router
📦 What is this software?
N3m Firmware by Netis Systems
⚠️ Risk & Real-World Impact
Worst Case
Complete device takeover leading to network compromise, data exfiltration, ransomware deployment, or use as botnet node for DDoS attacks.
Likely Case
Unauthenticated remote code execution allowing attackers to modify router settings, intercept traffic, or install malware.
If Mitigated
Limited impact if device is behind firewall with restricted WAN access and Dynamic DNS is disabled.
🎯 Exploit Status
Public GitHub repository contains detailed exploitation methodology. Simple curl commands can trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch available. Check Netis website for firmware updates. If update exists: 1. Download latest firmware from vendor site 2. Login to router admin panel 3. Navigate to firmware update section 4. Upload and apply new firmware 5. Reboot router
🔧 Temporary Workarounds
Disable Dynamic DNS
allCompletely disable Dynamic DNS feature to remove attack surface
Login to router admin panel → Advanced Settings → Dynamic DNS → Disable
Restrict WAN Access
allBlock router admin interface from internet access
Configure firewall to block port 80/443 to router WAN IP
🧯 If You Can't Patch
- Isolate affected routers in separate VLAN with strict network segmentation
- Implement network monitoring for unusual outbound connections from router
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin panel. If version is V1.0.1.865, device is vulnerable.Check Version:
Login to router web interface and check System Status or Firmware Version pageVerify Fix Applied:
Verify firmware version has changed from V1.0.1.865. Test Dynamic DNS functionality with safe inputs.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed Dynamic DNS update attempts with unusual domain names
- Process execution from web interface
Network Indicators:
- Unexpected outbound connections from router
- Traffic to suspicious domains/IPs
- Port scanning originating from router
SIEM Query:
source="router_logs" AND ("ddnsDomainName" CONTAINS "|" OR "ddnsDomainName" CONTAINS ";" OR "ddnsDomainName" CONTAINS "`")