CVE-2023-33299
📋 TL;DR
This vulnerability allows remote attackers to execute arbitrary code on Fortinet FortiNAC systems by sending specially crafted requests to the inter-server communication port. Attackers can achieve remote code execution without authentication. All FortiNAC versions below 7.2.1, below 9.4.3, below 9.2.8, and all 8.x versions are affected.
💻 Affected Systems
- Fortinet FortiNAC
📦 What is this software?
Fortinac by Fortinet
Fortinac by Fortinet
Fortinac by Fortinet
Fortinac by Fortinet
Fortinac by Fortinet
Fortinac by Fortinet
Fortinac by Fortinet
Fortinac by Fortinet
Fortinac by Fortinet
Fortinac by Fortinet
Fortinac by Fortinet
Fortinac by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to gain full control of FortiNAC, pivot to other network systems, deploy ransomware, or establish persistent backdoors.
Likely Case
Attackers exploit the vulnerability to execute arbitrary commands, potentially gaining administrative access to FortiNAC and using it as a foothold for lateral movement within the network.
If Mitigated
With proper network segmentation and access controls, impact is limited to the FortiNAC system itself, though it remains compromised.
🎯 Exploit Status
Exploitation requires network access to the inter-server communication port but no authentication. CVSS 9.8 indicates critical severity with low attack complexity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.2.1, 9.4.3, 9.2.8 or later
Vendor Advisory: https://fortiguard.com/psirt/FG-IR-23-074
Restart Required: Yes
Instructions:
1. Backup FortiNAC configuration. 2. Download appropriate patch from Fortinet support portal. 3. Apply patch following Fortinet upgrade procedures. 4. Restart FortiNAC services. 5. Verify successful update.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict access to FortiNAC inter-server communication port using firewall rules to only trusted management systems.
Network Segmentation
allIsolate FortiNAC systems in a dedicated management VLAN with strict access controls.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FortiNAC from critical systems
- Deploy intrusion detection/prevention systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check FortiNAC version via web interface (System > Status) or CLI 'get system status'Check Version:
get system status | grep VersionVerify Fix Applied:
Verify version is 7.2.1+, 9.4.3+, or 9.2.8+ and not 8.x📡 Detection & Monitoring
Log Indicators:
- Unusual process creation events
- Suspicious network connections from FortiNAC
- Authentication failures followed by successful access
Network Indicators:
- Unexpected traffic from FortiNAC to internal systems
- Connection attempts to FortiNAC inter-server port from unauthorized sources
SIEM Query:
source="fortinac" AND (event_type="process_creation" OR dest_port=inter_server_port) | stats count by src_ip