CVE-2025-53609
📋 TL;DR
A relative path traversal vulnerability in FortiWeb web application firewalls allows authenticated attackers to read arbitrary files on the underlying system. This affects FortiWeb versions 7.6.0-7.6.4, 7.4.0-7.4.8, 7.2.0-7.2.11, and 7.0.2-7.0.11. Attackers must have valid credentials to exploit this vulnerability.
💻 Affected Systems
- FortiWeb Web Application Firewall
📦 What is this software?
Fortiweb by Fortinet
Fortiweb by Fortinet
Fortiweb by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could read sensitive system files including configuration files, credentials, or other sensitive data, potentially leading to further system compromise.
Likely Case
Attackers with valid credentials could read configuration files to understand network topology or find other vulnerabilities to exploit.
If Mitigated
With proper access controls and monitoring, impact is limited to authenticated users reading non-critical files.
🎯 Exploit Status
Exploitation requires authenticated access and crafting specific requests with path traversal sequences.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to FortiWeb 7.6.5, 7.4.9, 7.2.12, or 7.0.12 depending on your current version
Vendor Advisory: https://fortiguard.fortinet.com/psirt/FG-IR-25-512
Restart Required: No
Instructions:
1. Log into FortiWeb management interface. 2. Navigate to System > Dashboard. 3. Check current version. 4. Download appropriate patch from Fortinet support portal. 5. Upload and install firmware update. 6. Verify successful update.
🔧 Temporary Workarounds
Restrict administrative access
allLimit administrative access to FortiWeb management interface to trusted IP addresses only
config system interface
edit <interface_name>
set allowaccess https ssh
set trustedhost <trusted_ip_range>
end
🧯 If You Can't Patch
- Implement strict access controls to limit administrative access to trusted users only
- Enable detailed logging and monitor for unusual file access patterns or path traversal attempts
🔍 How to Verify
Check if Vulnerable:
Check FortiWeb version via CLI: get system status | grep VersionCheck Version:
get system status | grep VersionVerify Fix Applied:
Verify version is updated to 7.6.5, 7.4.9, 7.2.12, or 7.0.12 or later📡 Detection & Monitoring
Log Indicators:
- Unusual file path patterns in web requests
- Multiple failed authentication attempts followed by successful login and file access
Network Indicators:
- HTTP requests containing '../' sequences to administrative endpoints
- Unusual file access patterns from authenticated sessions
SIEM Query:
source="fortiweb" AND (http_uri="*../*" OR http_uri="*..\\*" OR http_uri="*%2e%2e%2f*")