CVE-2021-29147
📋 TL;DR
CVE-2021-29147 is a remote command execution vulnerability in Aruba ClearPass Policy Manager that allows attackers to execute arbitrary commands on affected systems. This affects ClearPass Policy Manager versions prior to 6.9.5, 6.8.9, and 6.7.14-HF1. Attackers can potentially gain complete control of vulnerable systems.
💻 Affected Systems
- Aruba ClearPass Policy Manager
📦 What is this software?
Clearpass by Arubanetworks
Clearpass by Arubanetworks
Clearpass by Arubanetworks
Clearpass by Arubanetworks
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands, steal sensitive data, deploy malware, pivot to other network resources, and maintain persistent access.
Likely Case
Remote code execution leading to credential theft, lateral movement within the network, and installation of backdoors or ransomware.
If Mitigated
Limited impact if proper network segmentation, least privilege access, and monitoring are in place, though system compromise is still possible.
🎯 Exploit Status
Based on CVSS score and CWE-78 (OS Command Injection), exploitation is likely straightforward for attackers with network access to vulnerable systems.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.9.5, 6.8.9, or 6.7.14-HF1
Vendor Advisory: https://www.arubanetworks.com/assets/alert/ARUBA-PSA-2021-009.txt
Restart Required: Yes
Instructions:
1. Download appropriate patch version from Aruba support portal. 2. Backup current configuration. 3. Apply patch following Aruba's upgrade documentation. 4. Restart ClearPass services. 5. Verify successful upgrade and functionality.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to ClearPass management interfaces to trusted IP addresses only
Firewall Rules
allImplement strict firewall rules to limit inbound connections to ClearPass
🧯 If You Can't Patch
- Isolate ClearPass systems in a dedicated VLAN with strict access controls
- Implement network monitoring and intrusion detection for suspicious command execution patterns
🔍 How to Verify
Check if Vulnerable:
Check ClearPass version via web interface (Administration > Support > System Information) or CLI command 'show version'Check Version:
show versionVerify Fix Applied:
Verify version is 6.9.5, 6.8.9, or 6.7.14-HF1 or later📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Unexpected process creation
- Authentication attempts from unusual sources
Network Indicators:
- Suspicious outbound connections from ClearPass
- Unexpected network traffic patterns
SIEM Query:
source="clearpass" AND (event_type="command_execution" OR process="unusual_process")