CVE-2023-45467
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary commands on Netis N3Mv2 routers by injecting malicious input into the ntpServIP parameter in Time Settings. It affects users of Netis N3Mv2-V1.0.1.865 firmware. Exploitation can lead to full system compromise.
💻 Affected Systems
- Netis N3Mv2 router
📦 What is this software?
N3m Firmware by Netis Systems
⚠️ Risk & Real-World Impact
Worst Case
Complete takeover of the router, enabling data theft, network disruption, or use as a botnet node.
Likely Case
Unauthenticated remote code execution, allowing attackers to modify settings, intercept traffic, or deploy malware.
If Mitigated
Limited impact if network segmentation and strict access controls prevent external exploitation.
🎯 Exploit Status
Proof-of-concept details are publicly available, making exploitation straightforward for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not known
Restart Required: No
Instructions:
Check the vendor's website for firmware updates; if unavailable, consider workarounds or replacement.
🔧 Temporary Workarounds
Disable external NTP access
allRestrict NTP configuration to internal trusted servers only via the router's web interface.
Network segmentation
allIsolate the router on a separate VLAN to limit exposure and potential lateral movement.
🧯 If You Can't Patch
- Implement strict network access controls to block external access to the router's management interface.
- Monitor logs for unusual commands or NTP-related anomalies and consider replacing the device if updates are not forthcoming.
🔍 How to Verify
Check if Vulnerable:
Check the firmware version in the router's web interface under System or Admin settings; if it is V1.0.1.865, it is vulnerable.Check Version:
Log into the router's web interface and navigate to System Information or similar to view the firmware version.Verify Fix Applied:
Verify by updating to a patched firmware version (if available) and testing for command injection via the ntpServIP parameter.📡 Detection & Monitoring
Log Indicators:
- Unusual commands in system logs, unexpected NTP server changes, or shell command executions from web requests.
Network Indicators:
- Suspicious HTTP POST requests to the Time Settings endpoint with crafted ntpServIP parameters.
SIEM Query:
Example: search for web logs with 'ntpServIP' containing shell metacharacters like ;, |, or &.