CVE-2024-56915
📋 TL;DR
This vulnerability allows attackers to inject malicious scripts into Netbox's RSS feed widget, which are then executed in users' browsers when viewing the widget. It affects Netbox Community v4.1.7 installations. Users who access the RSS feed widget in vulnerable versions are at risk.
💻 Affected Systems
- Netbox Community
📦 What is this software?
Netbox by Netbox
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users, potentially leading to full account compromise.
Likely Case
Session hijacking, credential theft, or defacement of the Netbox interface through malicious script execution.
If Mitigated
With proper input validation and output encoding, the impact is limited to script execution in the user's browser context only.
🎯 Exploit Status
Exploitation requires the attacker to control or manipulate RSS feed content that is displayed in the widget.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v4.2.2
Vendor Advisory: https://github.com/netbox-community/netbox/releases/tag/v4.2.2
Restart Required: Yes
Instructions:
1. Backup your Netbox installation and database. 2. Update Netbox to version 4.2.2 or later using pip: 'pip install netbox==4.2.2'. 3. Run database migrations: 'python manage.py migrate'. 4. Restart the Netbox service.
🔧 Temporary Workarounds
Disable RSS Feed Widget
allRemove or disable the RSS feed widget from all Netbox dashboards to prevent exploitation.
Edit Netbox configuration to remove RSS widget references from dashboard configurations.
Content Security Policy
allImplement a strict Content Security Policy header to block inline script execution.
Add 'Content-Security-Policy: script-src 'self'' to web server configuration.
🧯 If You Can't Patch
- Disable RSS feed widget functionality entirely.
- Implement network segmentation to restrict access to Netbox from untrusted networks.
🔍 How to Verify
Check if Vulnerable:
Check Netbox version: if running v4.1.7 and RSS feed widget is enabled, the system is vulnerable.Check Version:
python -c "import netbox; print(netbox.__version__)"Verify Fix Applied:
Verify Netbox version is 4.2.2 or later and test RSS feed widget with malicious payloads to confirm sanitization.📡 Detection & Monitoring
Log Indicators:
- Unusual RSS feed URLs in access logs
- JavaScript payloads in HTTP requests to RSS endpoints
Network Indicators:
- HTTP requests containing script tags or JavaScript in RSS feed parameters
SIEM Query:
source="netbox.log" AND ("rss" OR "feed") AND ("script" OR "javascript" OR "onerror")