CVE-2023-45584
📋 TL;DR
A double free vulnerability in multiple Fortinet products allows privileged attackers to execute arbitrary code or commands via crafted HTTP/HTTPS requests. This affects FortiOS, FortiPAM, and FortiProxy across multiple versions. Attackers with administrative access can potentially gain full system control.
💻 Affected Systems
- FortiOS
- FortiPAM
- FortiProxy
📦 What is this software?
Fortios by Fortinet
Fortios by Fortinet
Fortios by Fortinet
Fortipam by Fortinet
Fortiproxy by Fortinet
Fortiproxy by Fortinet
Fortiproxy by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise leading to data exfiltration, lateral movement, and persistent backdoor installation
Likely Case
Privilege escalation leading to administrative control over affected devices
If Mitigated
Limited impact if proper network segmentation and least privilege access are enforced
🎯 Exploit Status
Requires authenticated privileged access; double free exploitation requires specific memory manipulation
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FortiOS 7.4.1+, 7.2.6+, 7.0.13+, 6.4.15+; FortiPAM 1.2+; FortiProxy 7.4.2+, 7.2.8+, 7.0.14+
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-23-209
Restart Required: No
Instructions:
1. Check current version with 'get system status'. 2. Download appropriate firmware from Fortinet support portal. 3. Upload firmware via GUI or CLI. 4. Install update following vendor documentation.
🔧 Temporary Workarounds
Restrict Management Access
allLimit HTTP/HTTPS management interface access to trusted IP addresses only
config system interface
edit <interface_name>
set allowaccess https http
set trust-ip-list <trusted_ips>
end
Disable Unused Management Protocols
allDisable HTTP/HTTPS management if not required
config system interface
edit <interface_name>
unset allowaccess
set allowaccess ssh ping
end
🧯 If You Can't Patch
- Implement strict network segmentation to isolate affected devices
- Enforce least privilege access controls and monitor privileged user activity
🔍 How to Verify
Check if Vulnerable:
Execute 'get system status' and compare version against affected rangesCheck Version:
get system status | grep VersionVerify Fix Applied:
Check version after update with 'get system status' and confirm it matches patched versions📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP/HTTPS requests to management interfaces
- Multiple memory allocation/deallocation errors in system logs
- Privilege escalation attempts
Network Indicators:
- Crafted HTTP packets to management ports (80, 443, 8080)
- Unusual traffic patterns from administrative IPs
SIEM Query:
source="fortigate" AND (http_method="POST" OR http_method="GET") AND url CONTAINS "/login" AND status>=400