CVE-2025-24364
📋 TL;DR
Authenticated attackers with admin panel access to vaultwarden can execute arbitrary system commands through a crafted favicon image when using sendmail configuration. This affects all vaultwarden instances with admin panel enabled and vulnerable versions. The vulnerability allows remote code execution on the server.
💻 Affected Systems
- vaultwarden (formerly bitwarden_rs)
📦 What is this software?
Vaultwarden by Dani Garcia
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise allowing attacker to steal all password vaults, install persistent backdoors, pivot to other systems, and potentially access sensitive data across the network.
Likely Case
Attacker gains shell access to the vaultwarden server, can exfiltrate password vaults, modify configurations, and potentially access other services on the same host.
If Mitigated
With proper network segmentation and admin panel access controls, impact limited to vaultwarden service disruption and potential credential exposure.
🎯 Exploit Status
Requires authenticated admin access, specific configuration changes, and crafted favicon image. Multiple steps needed for successful exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.33.0
Vendor Advisory: https://github.com/dani-garcia/vaultwarden/security/advisories/GHSA-h6cc-rc6q-23j4
Restart Required: No
Instructions:
1. Backup your vaultwarden data. 2. Update to version 1.33.0 or later using your deployment method (Docker, manual install, package manager). 3. Verify the update completed successfully. 4. Test basic functionality.
🔧 Temporary Workarounds
Disable Admin Panel
allDisable the admin panel interface to prevent authenticated attackers from accessing the vulnerable functionality.
Set ADMIN_TOKEN environment variable to empty or remove ADMIN_TOKEN from configuration
Restrict Admin Panel Access
linuxLimit admin panel access to trusted IP addresses only using firewall rules or reverse proxy configurations.
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
🧯 If You Can't Patch
- Disable admin panel completely by removing ADMIN_TOKEN from configuration
- Implement strict network segmentation to isolate vaultwarden server from other critical systems
🔍 How to Verify
Check if Vulnerable:
Check vaultwarden version. If version is below 1.33.0 and admin panel is enabled, system is vulnerable.Check Version:
docker exec vaultwarden vaultwarden --version or check web interface footerVerify Fix Applied:
Verify vaultwarden version is 1.33.0 or higher. Test admin panel functionality to ensure it works without allowing command injection.📡 Detection & Monitoring
Log Indicators:
- Unusual admin panel access patterns
- Configuration changes to mail settings
- Unexpected process execution from vaultwarden context
- Failed attempts to upload or process favicon images
Network Indicators:
- Unusual outbound connections from vaultwarden server
- SMTP traffic from vaultwarden to unexpected destinations
SIEM Query:
source="vaultwarden" AND (event="admin_login" OR event="config_change" OR event="mail_test")