CVE-2021-3064
📋 TL;DR
This is a critical memory corruption vulnerability in Palo Alto Networks GlobalProtect portal and gateway interfaces that allows unauthenticated attackers with network access to potentially execute arbitrary code with root privileges. It affects PAN-OS 8.1 versions earlier than 8.1.17. Prisma Access customers are not impacted.
💻 Affected Systems
- Palo Alto Networks GlobalProtect portal
- Palo Alto Networks GlobalProtect gateway
📦 What is this software?
Pan Os by Paloaltonetworks
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with root privileges leading to complete system compromise, data exfiltration, and persistent backdoor installation
Likely Case
Service disruption and denial of service affecting GlobalProtect VPN connectivity
If Mitigated
Limited impact if proper network segmentation and access controls prevent external access to GlobalProtect interfaces
🎯 Exploit Status
CVSS 9.8 indicates trivial exploitation with high impact. No authentication required and network access is the only prerequisite.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: PAN-OS 8.1.17 or later
Vendor Advisory: https://security.paloaltonetworks.com/CVE-2021-3064
Restart Required: Yes
Instructions:
1. Download PAN-OS 8.1.17 or later from Palo Alto support portal. 2. Upload to firewall management interface. 3. Install update via CLI or web interface. 4. Reboot firewall to complete installation.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to GlobalProtect portal and gateway interfaces to trusted IP addresses only
Configure firewall rules to limit GlobalProtect interface access to authorized networks
Disable GlobalProtect if not needed
allTemporarily disable GlobalProtect portal/gateway services if not essential for operations
Disable GlobalProtect portal and gateway configurations in PAN-OS
🧯 If You Can't Patch
- Implement strict network segmentation to isolate GlobalProtect interfaces from untrusted networks
- Deploy intrusion prevention systems with signatures for CVE-2021-3064 to detect and block exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check PAN-OS version via CLI: show system info | match version. If version is 8.1.x and less than 8.1.17, system is vulnerable.Check Version:
show system info | match versionVerify Fix Applied:
After patching, verify version is 8.1.17 or higher: show system info | match version📡 Detection & Monitoring
Log Indicators:
- Unusual traffic patterns to GlobalProtect interfaces
- Memory corruption errors in system logs
- Unexpected process crashes on firewall
Network Indicators:
- Unusual network traffic to GlobalProtect portal/gateway ports (default TCP 443)
- Exploit pattern detection in network traffic
SIEM Query:
source="pan-firewall" AND (dest_port=443 OR service="globalprotect") AND bytes>1000000