CVE-2021-3059
📋 TL;DR
This CVE-2021-3059 is an OS command injection vulnerability in Palo Alto Networks PAN-OS management interface that allows man-in-the-middle attackers to execute arbitrary OS commands and escalate privileges during dynamic updates. It affects PAN-OS versions 8.1 through 10.1 and Prisma Access 2.1 firewalls. Successful exploitation could lead to complete system compromise.
💻 Affected Systems
- Palo Alto Networks PAN-OS
- Prisma Access
📦 What is this software?
Pan Os by Paloaltonetworks
Pan Os by Paloaltonetworks
Pan Os by Paloaltonetworks
Pan Os by Paloaltonetworks
Pan Os by Paloaltonetworks
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with root/admin privileges, allowing attacker to install persistent backdoors, steal sensitive data, pivot to other systems, and disrupt network operations.
Likely Case
Privilege escalation leading to unauthorized administrative access, configuration changes, and potential lateral movement within the network.
If Mitigated
Limited impact due to network segmentation, proper access controls, and monitoring preventing successful man-in-the-middle attacks.
🎯 Exploit Status
Exploitation requires man-in-the-middle position and knowledge of the vulnerability. No public exploit code available at time of advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: PAN-OS 8.1.20-h1, PAN-OS 9.0.14-h3, PAN-OS 9.1.11-h2, PAN-OS 10.0.8, PAN-OS 10.1.3
Vendor Advisory: https://security.paloaltonetworks.com/CVE-2021-3059
Restart Required: Yes
Instructions:
1. Download appropriate PAN-OS hotfix from Palo Alto support portal. 2. Upload to firewall via web interface or CLI. 3. Install hotfix via web interface or CLI. 4. Reboot firewall to complete installation. 5. Verify version after reboot.
🔧 Temporary Workarounds
Restrict Management Interface Access
allLimit management interface access to trusted networks only and implement strict network segmentation.
Use Encrypted Management Channels
allEnsure all management traffic uses encrypted protocols (HTTPS, SSH) with certificate validation.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate management interfaces from untrusted networks
- Deploy network monitoring and intrusion detection systems to detect man-in-the-middle attacks
🔍 How to Verify
Check if Vulnerable:
Check PAN-OS version via web interface (Device > Setup > Operations) or CLI command: show system infoCheck Version:
show system info | match versionVerify Fix Applied:
Verify PAN-OS version matches or exceeds patched versions: 8.1.20-h1, 9.0.14-h3, 9.1.11-h2, 10.0.8, or 10.1.3📡 Detection & Monitoring
Log Indicators:
- Unexpected command execution in system logs
- Unauthorized configuration changes
- Failed authentication attempts on management interface
Network Indicators:
- Unusual traffic patterns during dynamic updates
- Man-in-the-middle attack indicators
- Unexpected outbound connections from firewall
SIEM Query:
source="pan-firewall" AND (event_type="SYSTEM" OR event_type="CONFIG") AND (message="*command*" OR message="*exec*" OR message="*injection*")