Nautobot, Unauthenticated File Access, CVE-2024-XXXX (Critical)

Listen to this Post

🐢▶️ Listen🚀

How the CVE Works

The vulnerability (CVE-2024-XXXX) in Nautobot allows unauthenticated users to access sensitive files stored in the `MEDIA_ROOT` directory, including DeviceType images, Location, Device, and Rack attachments. The issue arises because the endpoint serving these files does not enforce authentication, enabling attackers to retrieve files by guessing or brute-forcing URLs. While DeviceType images lack a directory listing, making them harder to enumerate, other attachments can be listed via `/api/extras/image-attachments/` if an attacker gains authenticated access. Without authentication, attackers must guess filenames, but weak naming conventions increase exposure risk.

DailyCVE Form

Platform: Nautobot
Version: <2.4.10, <1.6.32
Vulnerability: Unauthenticated file access
Severity: Critical
Date: 2024-XX-XX

Prediction: Patch by 2024-Q2

What Undercode Say:

Exploitation:

1. URL Enumeration: Attackers guess file paths (e.g., `http://target/media/devicetype-images/example.jpg`).
2. Brute-Force Script: Use Python to test common filenames:

   import requests
   for name in ["rack1.jpg", "device.png"]:
   r = requests.get(f"http://nautobot.example.com/media/{name}")
   if r.status_code == 200:
   print(f"Exposed: {name}")
   

3. API Abuse: If auth is bypassed, query `/api/extras/image-attachments/` to list files.

Protection:

1. Patch Immediately: Upgrade to Nautobot v2.4.10/v1.6.32.

1. Access Control: Restrict `MEDIA_ROOT` via web server (e.g., Nginx):

   location /media/ {
   auth_request /auth-endpoint;
   deny all;
   }
   

2. Log Monitoring: Alert on repeated 200/403 responses to detect scanning.
3. Workaround: Manually patch `urls.py` to enforce `@login_required` on media routes.

Detection Commands:

• Check Exposure:

  curl -I http://nautobot/media/devicetype-images/ | grep "200 OK"
  

• Audit Files:

  find /opt/nautobot/media -type f -ls | grep -v "root"
  

Analytics:

• Risk Score: 9.2 (CVSS:3.1) due to low attack complexity.
• Attack Surface: Reduced if filenames are randomized.
• Patch Verification: Confirm auth is required post-update:

  curl -v http://patched-nautobot/media/ | grep "403 Forbidden"
  

  No third-party references provided; mitigation relies on vendor patches.

Sources:

Reported By: github.com
Extra Source Hub:
Undercode

Join Our Cyber World:

💬 Whatsapp | 💬 Telegram