CVE-2024-54780
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary commands on pfSense firewalls through the OpenVPN widget. Attackers can inject OpenVPN management commands via the remipp parameter, potentially gaining full system control. All pfSense CE versions before 2.8.0 beta and corresponding Plus builds are affected.
💻 Affected Systems
- pfSense CE
- pfSense Plus
📦 What is this software?
Pfsense Ce by Netgate
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to execute arbitrary commands as root, pivot to internal networks, install persistent backdoors, or exfiltrate sensitive firewall configuration data.
Likely Case
Attacker gains shell access on the firewall, can modify firewall rules, intercept network traffic, or use the firewall as a pivot point to attack internal systems.
If Mitigated
With proper network segmentation and access controls, impact is limited to the firewall itself, though this still represents a critical security boundary compromise.
🎯 Exploit Status
Exploitation requires authenticated access to the web interface. The vulnerability is well-documented with public proof-of-concept available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: pfSense CE 2.7.2 and pfSense Plus 24.11
Vendor Advisory: https://www.netgate.com/blog/important-security-updates-for-pfsense-plus-24.11-and-ce-2.7.2
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Update via System > Update in web interface. 3. Apply pending updates. 4. Reboot system. 5. Verify update completed successfully.
🔧 Temporary Workarounds
Disable OpenVPN Widget
allRemove the OpenVPN widget from the dashboard to prevent exploitation through the vulnerable interface.
Login to pfSense web interface > Dashboard > Click 'Add Widgets' > Remove OpenVPN widget if present
Restrict Web Interface Access
allLimit access to the pfSense web interface to trusted IP addresses only.
System > Advanced > Admin Access > Restrict administration panel to specific hosts
🧯 If You Can't Patch
- Implement strict network segmentation to isolate pfSense management interface
- Enforce multi-factor authentication for all administrative accounts
🔍 How to Verify
Check if Vulnerable:
Check pfSense version via System > Dashboard > Version Information. If version is below CE 2.7.2 or Plus 24.11, system is vulnerable.Check Version:
ssh admin@pfSense-host 'cat /etc/version' or check web interface System > DashboardVerify Fix Applied:
Verify version is CE 2.7.2 or higher, or Plus 24.11 or higher. Check that OpenVPN widget no longer accepts malicious remipp parameter input.📡 Detection & Monitoring
Log Indicators:
- Unusual OpenVPN management commands in system logs
- Suspicious command execution patterns from web interface
- Multiple failed authentication attempts followed by successful login
Network Indicators:
- Unexpected outbound connections from pfSense firewall
- Anomalous traffic patterns through OpenVPN interfaces
- Management interface accessed from unusual IP addresses
SIEM Query:
source="pfSense" AND (event_type="command_execution" OR process="sh" OR process="bash") AND user="root"