CVE-2023-50178
📋 TL;DR
This CVE describes an improper certificate validation vulnerability in FortiADC that allows remote unauthenticated attackers to perform Man-in-the-Middle attacks. The vulnerability affects communication between the device and remote servers like private SDN connectors and FortiToken Cloud. All organizations running affected FortiADC versions are potentially vulnerable.
💻 Affected Systems
- FortiADC
📦 What is this software?
Fortiadc by Fortinet
Fortiadc by Fortinet
Fortiadc by Fortinet
Fortiadc by Fortinet
Fortiadc by Fortinet
Fortiadc by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of encrypted communications, allowing attackers to intercept, modify, or inject traffic between FortiADC and remote services, potentially leading to credential theft, data exfiltration, or service disruption.
Likely Case
Attackers intercepting sensitive administrative communications, potentially gaining access to management credentials or manipulating configuration updates.
If Mitigated
Limited impact if proper network segmentation and certificate pinning are implemented, though the fundamental vulnerability remains.
🎯 Exploit Status
Requires network positioning to intercept traffic between FortiADC and remote servers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.4.1 or later, 7.2.4 or later
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-22-298
Restart Required: Yes
Instructions:
1. Download the appropriate firmware update from Fortinet support portal. 2. Backup current configuration. 3. Apply firmware update through FortiADC web interface or CLI. 4. Reboot device after update completion. 5. Verify version and functionality.
🔧 Temporary Workarounds
Network Segmentation
allIsolate FortiADC management traffic from untrusted networks
Certificate Pinning
allImplement certificate pinning for connections to remote services where supported
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FortiADC management interfaces
- Monitor network traffic for unusual certificate validation failures or MITM indicators
🔍 How to Verify
Check if Vulnerable:
Check FortiADC firmware version via web interface (System > Dashboard) or CLI command 'get system status'Check Version:
get system status | grep VersionVerify Fix Applied:
Verify firmware version is 7.4.1+, 7.2.4+, or other patched versions not in affected range📡 Detection & Monitoring
Log Indicators:
- Certificate validation failures in FortiADC logs
- Unexpected certificate changes for remote services
- Authentication failures with FortiToken Cloud
Network Indicators:
- Unusual SSL/TLS handshake patterns
- Certificate mismatches in traffic to/from FortiADC
- Unexpected proxy or MITM tools in network path
SIEM Query:
source="fortiadc" AND ("certificate validation" OR "SSL error" OR "TLS handshake failed")