CVE-2023-29183
📋 TL;DR
This cross-site scripting (XSS) vulnerability in Fortinet's FortiProxy and FortiOS web management interfaces allows authenticated attackers to inject and execute malicious JavaScript code via crafted guest management settings. Attackers could steal session cookies, perform actions as the authenticated user, or redirect users to malicious sites. Affected users include organizations running vulnerable versions of FortiProxy or FortiOS with web management interfaces accessible to authenticated users.
💻 Affected Systems
- FortiProxy
- FortiOS
📦 What is this software?
Fortios by Fortinet
Fortios by Fortinet
Fortios by Fortinet
Fortios by Fortinet
Fortiproxy by Fortinet
Fortiproxy by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
An authenticated attacker could steal administrator session cookies, gain full administrative access to the firewall/proxy, modify configurations, create backdoor accounts, intercept network traffic, or pivot to internal networks.
Likely Case
Attackers with valid credentials could perform session hijacking, steal sensitive information from the management interface, or perform limited administrative actions depending on their privilege level.
If Mitigated
With proper network segmentation and access controls, impact is limited to the management interface itself without lateral movement capabilities.
🎯 Exploit Status
Exploitation requires authenticated access to the web interface. The vulnerability is in the guest management settings page where crafted input is not properly sanitized.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FortiProxy 7.2.5, 7.0.11; FortiOS 7.2.5, 7.0.12, 6.4.13, 6.2.15
Vendor Advisory: https://fortiguard.com/psirt/FG-IR-23-106
Restart Required: Yes
Instructions:
1. Download the appropriate firmware version from Fortinet support portal. 2. Backup current configuration. 3. Upload and install the firmware update via web interface or CLI. 4. Reboot the device after installation. 5. Verify the update was successful.
🔧 Temporary Workarounds
Restrict Web Interface Access
allLimit access to the management interface to trusted IP addresses only
config system interface
edit <interface_name>
set allowaccess https ssh ping
set trust-ip-1 <trusted_ip>
end
Disable Guest Management
allDisable guest management feature if not required
config wireless-controller vap
edit <vap_name>
set schedule 'always'
set ssid 'disabled_ssid'
set schedule 'disable'
end
🧯 If You Can't Patch
- Implement strict network segmentation to isolate management interfaces from user networks
- Enforce multi-factor authentication for all administrative accounts
🔍 How to Verify
Check if Vulnerable:
Check current firmware version via CLI: 'get system status' or web interface System > Dashboard. Compare against affected versions.Check Version:
get system status | grep VersionVerify Fix Applied:
After patching, verify version is equal to or greater than: FortiProxy 7.2.5/7.0.11, FortiOS 7.2.5/7.0.12/6.4.13/6.2.15📡 Detection & Monitoring
Log Indicators:
- Unusual guest management configuration changes
- Multiple failed login attempts followed by successful login
- Administrative actions from unexpected user accounts or IPs
Network Indicators:
- HTTP requests containing JavaScript payloads to guest management endpoints
- Unusual outbound connections from management interface
SIEM Query:
source="fortigate" AND (url="*guest*" OR url="*vap*" OR url="*wireless*") AND (http_content="*script*" OR http_content="*javascript*" OR http_content="*onerror*" OR http_content="*onload*")