CVE-2024-23106
📋 TL;DR
This vulnerability allows unauthenticated attackers to perform brute force attacks against the FortiClientEMS console by sending excessive authentication attempts via HTTP/HTTPS requests. It affects FortiClientEMS versions 7.2.0 through 7.2.4 and versions before 7.0.10. Attackers could potentially gain administrative access to the EMS console.
💻 Affected Systems
- FortiClientEMS
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative access to FortiClientEMS console, allowing them to deploy malicious configurations, steal credentials, or compromise managed endpoints.
Likely Case
Attackers successfully brute force weak administrator passwords, gaining unauthorized access to the EMS management interface.
If Mitigated
Attack attempts are detected and blocked by rate limiting or account lockout mechanisms before successful compromise.
🎯 Exploit Status
Exploitation requires only HTTP/HTTPS access to the EMS console and ability to send authentication requests. No special tools or knowledge needed beyond basic HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.2.5 or 7.0.10 and later
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-23-476
Restart Required: Yes
Instructions:
1. Download FortiClientEMS version 7.2.5 or 7.0.10 from Fortinet support portal. 2. Backup current configuration. 3. Install the update following Fortinet's upgrade guide. 4. Restart the EMS service or server.
🔧 Temporary Workarounds
Network Access Control
allRestrict access to FortiClientEMS console to trusted IP addresses only
Strong Password Enforcement
allEnforce complex, long passwords for all EMS administrator accounts to resist brute force attempts
🧯 If You Can't Patch
- Implement network segmentation to restrict access to FortiClientEMS console
- Enable detailed logging and monitoring for failed authentication attempts
🔍 How to Verify
Check if Vulnerable:
Check FortiClientEMS version via web interface or CLI. If version is between 7.2.0-7.2.4 or below 7.0.10, system is vulnerable.Check Version:
From EMS CLI: get system status | grep VersionVerify Fix Applied:
Verify version is 7.2.5 or higher, or 7.0.10 or higher. Test authentication with multiple failed attempts to confirm rate limiting is working.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts from single IP address
- Unusual authentication patterns outside business hours
Network Indicators:
- High volume of HTTP POST requests to /login endpoint
- Multiple authentication failures followed by success
SIEM Query:
source="forticlientems" AND (event_type="authentication_failure" AND count > 10 within 5 minutes)