CVE-2023-50181
📋 TL;DR
An improper access control vulnerability in Fortinet FortiADC allows authenticated read-only users to perform unauthorized write actions via crafted HTTP/HTTPS requests. This affects FortiADC versions 7.4.0 through 7.4.1 and versions before 7.2.4. Attackers with read-only credentials can potentially modify configurations or settings they shouldn't have access to.
💻 Affected Systems
- Fortinet FortiADC
📦 What is this software?
Fortiadc by Fortinet
Fortiadc by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
An attacker with read-only credentials could modify critical system configurations, disrupt services, create backdoors, or escalate privileges to administrative access.
Likely Case
Read-only users could modify non-critical settings, alter logging configurations, or make unauthorized changes to application delivery policies.
If Mitigated
With proper network segmentation and access controls, impact would be limited to the affected FortiADC instance only.
🎯 Exploit Status
Exploitation requires valid read-only credentials and network access to the management interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.4.2 or 7.2.4 and later
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-23-469
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Download appropriate firmware version from Fortinet support portal. 3. Upload firmware to FortiADC via GUI or CLI. 4. Install firmware update. 5. Reboot device. 6. Verify version and functionality.
🔧 Temporary Workarounds
Restrict Management Access
allLimit access to FortiADC management interface to trusted IP addresses only
config system interface
edit <mgmt-interface>
set allowaccess https ssh
set trust-ip <trusted-ip-range>
end
Minimize Read-Only Accounts
allReview and remove unnecessary read-only user accounts
config system admin
edit <username>
delete
end
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FortiADC management interface
- Enforce principle of least privilege by reviewing and minimizing read-only user accounts
🔍 How to Verify
Check if Vulnerable:
Check FortiADC firmware version via GUI (System > Dashboard) or CLI (get system status)Check Version:
get system status | grep VersionVerify Fix Applied:
Verify firmware version is 7.4.2 or later, or 7.2.4 or later📡 Detection & Monitoring
Log Indicators:
- Unusual write operations from read-only user accounts
- Configuration changes from non-admin users
- Failed authentication attempts followed by successful read-only access
Network Indicators:
- HTTP/HTTPS POST/PUT requests to management interface from read-only users
- Unusual traffic patterns to FortiADC management ports
SIEM Query:
source="fortiadc" AND (event_type="config_change" AND user_role="read-only")