CVE-2023-38096
📋 TL;DR
This vulnerability allows remote attackers to bypass authentication on NETGEAR ProSAFE Network Management System installations without requiring any credentials. The flaw exists in the MyHandlerInterceptor class due to improper authentication implementation. Organizations using affected NETGEAR ProSAFE NMS versions are at risk.
💻 Affected Systems
- NETGEAR ProSAFE Network Management System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the network management system, allowing attackers to reconfigure network devices, intercept traffic, deploy malware, or disrupt network operations.
Likely Case
Unauthorized access to network management functions, enabling attackers to view sensitive network configurations, modify device settings, or create backdoor accounts.
If Mitigated
Limited impact if system is isolated behind firewalls with strict access controls, but authentication bypass still presents significant risk.
🎯 Exploit Status
The vulnerability requires no authentication and has a simple exploitation path. While no public PoC exists, the technical details are sufficient for skilled attackers to develop exploits.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.7.0.26 or later
Vendor Advisory: https://kb.netgear.com/000065707/Security-Advisory-for-Multiple-Vulnerabilities-on-the-ProSAFE-Network-Management-System-PSV-2023-0024-PSV-2023-0025
Restart Required: Yes
Instructions:
1. Download the latest version from NETGEAR support portal. 2. Backup current configuration. 3. Stop the NMS service. 4. Install the update. 5. Restart the service. 6. Verify the update was successful.
🔧 Temporary Workarounds
Network Isolation
linuxRestrict access to the NMS web interface using firewall rules
# Example iptables rule: iptables -A INPUT -p tcp --dport [NMS_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
# iptables -A INPUT -p tcp --dport [NMS_PORT] -j DROP
Reverse Proxy with Authentication
allPlace NMS behind a reverse proxy with additional authentication layer
# Configure nginx/apache with basic auth or client certificate authentication
🧯 If You Can't Patch
- Immediately isolate the NMS system from untrusted networks using firewall rules
- Implement network segmentation to limit the NMS system's access to only essential network devices
🔍 How to Verify
Check if Vulnerable:
Check the NMS version in the web interface under Help > About or via the system status page. If version is below 1.7.0.26, the system is vulnerable.Check Version:
Check web interface or examine installation directory for version informationVerify Fix Applied:
After patching, verify the version shows 1.7.0.26 or higher. Test authentication by attempting to access protected endpoints without credentials.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated access to protected endpoints
- Authentication bypass attempts in web server logs
- Access to admin functions from unexpected IP addresses
Network Indicators:
- HTTP requests to protected endpoints without authentication headers
- Unusual traffic patterns to NMS web interface
SIEM Query:
source="NMS_LOGS" AND (uri="/admin/*" OR uri="/config/*") AND NOT (user!="" OR auth_token!="")🔗 References
- https://kb.netgear.com/000065707/Security-Advisory-for-Multiple-Vulnerabilities-on-the-ProSAFE-Network-Management-System-PSV-2023-0024-PSV-2023-0025
- https://www.zerodayinitiative.com/advisories/ZDI-23-920/
- https://kb.netgear.com/000065707/Security-Advisory-for-Multiple-Vulnerabilities-on-the-ProSAFE-Network-Management-System-PSV-2023-0024-PSV-2023-0025
- https://www.zerodayinitiative.com/advisories/ZDI-23-920/
