CVE-2023-7308
📋 TL;DR
The SecGate3600 firewall has an authentication bypass vulnerability in its user management endpoint that allows unauthenticated attackers to retrieve sensitive user and configuration data. This affects all organizations using NSFOCUS SecGate3600 firewalls with the vulnerable component exposed. Attackers can exploit this remotely without any credentials.
💻 Affected Systems
- NSFOCUS SecGate3600 Firewall
📦 What is this software?
Secgate3600 Firmware by Nsfocusglobal
⚠️ Risk & Real-World Impact
Worst Case
Attackers obtain administrative credentials, pivot to internal networks, and compromise the entire firewall infrastructure leading to full network compromise.
Likely Case
Attackers harvest user information and configuration details to plan further attacks, potentially leading to credential theft and lateral movement.
If Mitigated
With proper network segmentation and access controls, impact is limited to information disclosure without direct system compromise.
🎯 Exploit Status
Public exploit script available on GitHub. Exploitation observed in the wild by Shadowserver Foundation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
1. Contact NSFOCUS support for patch availability. 2. Apply vendor-provided security updates. 3. Verify the /cgi-bin/authUser/authManageSet.cgi endpoint is no longer accessible without authentication.
🔧 Temporary Workarounds
Network Access Control
allRestrict access to the firewall management interface to trusted IP addresses only.
Configure firewall rules to allow management access only from specific source IPs/networks
Endpoint Blocking
allBlock access to the vulnerable endpoint using web application firewall or reverse proxy rules.
Add rule to block requests to /cgi-bin/authUser/authManageSet.cgi
🧯 If You Can't Patch
- Isolate the firewall from internet access and restrict management interface to internal networks only
- Implement strict network segmentation to limit potential lateral movement if data is exfiltrated
🔍 How to Verify
Check if Vulnerable:
Send POST request to https://[firewall-ip]/cgi-bin/authUser/authManageSet.cgi and check if it returns user data without authenticationCheck Version:
Check firewall web interface or CLI for current firmware versionVerify Fix Applied:
Attempt the same request after applying controls - should receive authentication error or no response📡 Detection & Monitoring
Log Indicators:
- Unauthenticated POST requests to /cgi-bin/authUser/authManageSet.cgi
- Unusual data export patterns from firewall
Network Indicators:
- HTTP POST requests to vulnerable endpoint from untrusted sources
- Data exfiltration patterns from firewall management interface
SIEM Query:
source_ip NOT IN trusted_networks AND uri_path="/cgi-bin/authUser/authManageSet.cgi" AND http_method="POST"