CVE-2024-40741
📋 TL;DR
This CVE describes a cross-site scripting (XSS) vulnerability in NetBox v4.0.3 that allows attackers to inject malicious scripts into the circuit ID parameter. When exploited, this enables execution of arbitrary web scripts or HTML in victims' browsers. Organizations running vulnerable NetBox instances with exposed edit interfaces are affected.
💻 Affected Systems
- NetBox
📦 What is this software?
Netbox by Netbox
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, perform actions as authenticated users, redirect to malicious sites, or install malware on user systems.
Likely Case
Session hijacking, credential theft, or defacement of the NetBox interface through script execution in authenticated users' browsers.
If Mitigated
Limited impact with proper input validation, output encoding, and Content Security Policy (CSP) headers in place.
🎯 Exploit Status
Exploitation requires authenticated access to the circuits edit interface. Public proof-of-concept demonstrates the injection vector.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v4.0.4 or later
Vendor Advisory: https://github.com/netbox-community/netbox/releases
Restart Required: Yes
Instructions:
1. Backup your NetBox database and configuration. 2. Update NetBox to version 4.0.4 or later using pip: 'pip install --upgrade netbox'. 3. Run database migrations: 'python manage.py migrate'. 4. Restart the NetBox service.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side validation to sanitize circuit ID parameter input
Implement Django form validation or middleware to sanitize the 'id' parameter in circuit edit views
Content Security Policy
allAdd CSP headers to restrict script execution sources
Add 'Content-Security-Policy: default-src 'self'; script-src 'self'' to web server configuration
🧯 If You Can't Patch
- Restrict access to /circuits/circuits/*/edit/ endpoints using web application firewall rules or network ACLs
- Implement additional authentication requirements for circuit editing functionality
🔍 How to Verify
Check if Vulnerable:
Check if NetBox version is 4.0.3 by accessing the admin interface or running 'pip show netbox'Check Version:
pip show netbox | grep VersionVerify Fix Applied:
Confirm NetBox version is 4.0.4 or later and test circuit ID parameter with XSS payloads that should be sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to circuit edit endpoints with script tags or JavaScript in parameters
- Multiple failed authentication attempts followed by circuit edit requests
Network Indicators:
- HTTP requests containing <script> tags or JavaScript in circuit ID parameters
- Unusual outbound connections from NetBox server after circuit edits
SIEM Query:
source="netbox.log" AND (uri_path="/circuits/circuits/*/edit/" AND (param="id" CONTAINS "<script>" OR param="id" CONTAINS "javascript:"))