CVE-2023-46717
📋 TL;DR
This vulnerability allows a read-only user to escalate privileges to read-write access through successive login attempts in FortiOS when configured with FortiAuthenticator in HA mode. It affects FortiOS versions 7.4.1 and below, 7.2.6 and below, and 7.0.12 and below. Organizations using these configurations are at risk of unauthorized administrative access.
💻 Affected Systems
- FortiOS
📦 What is this software?
Fortios by Fortinet
Fortios by Fortinet
Fortios by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
An attacker gains full administrative control over the FortiOS device, enabling them to modify configurations, create backdoors, intercept traffic, or disable security controls entirely.
Likely Case
A malicious insider or compromised low-privilege account escalates to administrative privileges, potentially modifying firewall rules, VPN settings, or network policies.
If Mitigated
With proper network segmentation and monitoring, the impact is limited to the affected FortiOS device, with quick detection of unauthorized configuration changes.
🎯 Exploit Status
Requires existing read-only user credentials and specific HA configuration with FortiAuthenticator.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FortiOS 7.4.2, 7.2.7, 7.0.13
Vendor Advisory: https://fortiguard.com/psirt/FG-IR-23-424
Restart Required: Yes
Instructions:
1. Download the appropriate patched version from Fortinet support portal. 2. Backup current configuration. 3. Upload and install the firmware update. 4. Reboot the device. 5. Verify the new version is running.
🔧 Temporary Workarounds
Disable FortiAuthenticator HA
allTemporarily remove FortiAuthenticator from High Availability configuration if possible.
Restrict Read-Only User Access
allMinimize or temporarily disable read-only user accounts until patching can be completed.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FortiOS management interfaces
- Enable detailed logging and monitoring for authentication events and configuration changes
🔍 How to Verify
Check if Vulnerable:
Check FortiOS version via web GUI or CLI 'get system status' and verify FortiAuthenticator HA configuration.Check Version:
get system status | grep VersionVerify Fix Applied:
After patching, verify version is 7.4.2, 7.2.7, or 7.0.13 or higher using 'get system status' command.📡 Detection & Monitoring
Log Indicators:
- Multiple rapid authentication attempts from same read-only user
- Unexpected privilege escalation events
- Configuration changes from previously read-only accounts
Network Indicators:
- Unusual administrative traffic patterns
- Configuration changes during non-maintenance hours
SIEM Query:
source="fortios" AND (event_type="authentication" AND result="success" AND user_role="read-only") | stats count by user, src_ip