CVE-2024-31488
📋 TL;DR
This vulnerability allows remote authenticated attackers to inject malicious scripts into FortiNAC web pages, enabling stored and reflected cross-site scripting (XSS) attacks. Attackers can execute arbitrary JavaScript in victims' browsers, potentially stealing session cookies, credentials, or performing actions on behalf of authenticated users. Affected systems include FortiNAC versions 7.2.0-7.2.3, 8.7.0-8.7.6, 8.8.0-8.8.11, 9.1.0-9.1.10, 9.2.0-9.2.8, and 9.4.0-9.4.4.
💻 Affected Systems
- FortiNAC
📦 What is this software?
Fortinac by Fortinet
Fortinac by Fortinet
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal administrator credentials, hijack sessions, install backdoors, pivot to internal networks, or deploy ransomware across managed endpoints.
Likely Case
Attackers steal session cookies to impersonate authenticated users, access sensitive network data, or modify network access policies.
If Mitigated
Limited to authenticated user compromise with no privilege escalation beyond the victim's permissions.
🎯 Exploit Status
Exploitation requires authenticated access but uses simple HTTP request manipulation. No public exploit code available as of advisory date.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: FortiNAC 9.4.5, 9.2.9, 9.1.11, 8.8.12, 8.7.7, 7.2.4
Vendor Advisory: https://fortiguard.com/psirt/FG-IR-24-040
Restart Required: Yes
Instructions:
1. Download appropriate patch version from Fortinet support portal. 2. Backup current configuration. 3. Apply patch via FortiNAC admin interface. 4. Restart FortiNAC services. 5. Verify version update.
🔧 Temporary Workarounds
Input Validation Filtering
allImplement web application firewall (WAF) rules to filter malicious script patterns in HTTP requests.
Content Security Policy
allImplement strict CSP headers to prevent script execution from untrusted sources.
🧯 If You Can't Patch
- Restrict FortiNAC web interface access to trusted IP addresses only
- Implement multi-factor authentication for all FortiNAC administrative accounts
🔍 How to Verify
Check if Vulnerable:
Check FortiNAC version via admin interface: System > Status > Version. Compare against affected version ranges.Check Version:
Not applicable - check via FortiNAC web interfaceVerify Fix Applied:
Verify version is updated to 9.4.5, 9.2.9, 9.1.11, 8.8.12, 8.7.7, or 7.2.4 in System > Status > Version.📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP POST/GET requests with script tags or JavaScript payloads
- Multiple failed authentication attempts followed by successful login and script injection patterns
Network Indicators:
- HTTP requests containing <script>, javascript:, or eval() patterns to FortiNAC endpoints
SIEM Query:
source="fortinac" AND (http_request="*<script>*" OR http_request="*javascript:*" OR http_request="*eval(*")