CVE-2022-24299
📋 TL;DR
This vulnerability allows authenticated attackers with OpenVPN configuration privileges to execute arbitrary commands on pfSense firewalls due to improper input validation. It affects pfSense CE versions before 2.6.0 and pfSense Plus versions before 22.01. Attackers can gain full system control if they have access to the web interface with appropriate permissions.
💻 Affected Systems
- pfSense CE
- pfSense Plus
📦 What is this software?
Pfsense by Netgate
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to install persistent backdoors, pivot to internal networks, steal credentials, and disrupt network operations.
Likely Case
Privilege escalation leading to unauthorized access to firewall configuration, network traffic interception, and lateral movement to connected systems.
If Mitigated
Limited to authorized users who already have OpenVPN configuration access, with proper network segmentation preventing lateral movement.
🎯 Exploit Status
Exploitation requires authenticated access to web interface with OpenVPN configuration privileges. Public exploit details available in security advisories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: pfSense CE 2.6.0+, pfSense Plus 22.01+
Vendor Advisory: https://docs.netgate.com/downloads/pfSense-SA-22_03.webgui.asc
Restart Required: No
Instructions:
1. Backup current configuration. 2. Update via System > Update in web interface. 3. Apply update and confirm successful installation. 4. Verify version shows 2.6.0+ (CE) or 22.01+ (Plus).
🔧 Temporary Workarounds
Restrict OpenVPN Configuration Access
allLimit which users have privileges to modify OpenVPN settings
Navigate to System > User Manager > Edit User > Privileges tab > Remove 'OpenVPN - Clients' and 'OpenVPN - Servers' privileges
Network Segmentation
allRestrict access to pfSense web interface to trusted networks only
Configure firewall rules to limit web interface access to specific IP ranges
🧯 If You Can't Patch
- Implement strict access controls limiting who can modify OpenVPN settings
- Monitor for suspicious OpenVPN configuration changes and command execution attempts
🔍 How to Verify
Check if Vulnerable:
Check pfSense version via web interface Dashboard or CLI: pfSense versionCheck Version:
pfSense versionVerify Fix Applied:
Confirm version is pfSense CE 2.6.0+ or pfSense Plus 22.01+📡 Detection & Monitoring
Log Indicators:
- Unexpected OpenVPN configuration changes
- Suspicious command execution in system logs
- Unauthorized user accessing OpenVPN settings
Network Indicators:
- Unusual outbound connections from pfSense device
- Traffic patterns inconsistent with normal OpenVPN usage
SIEM Query:
source="pfSense" AND (event_type="config_change" AND component="openvpn") OR (process_execution AND parent_process="webgui")