CVE-2020-28884
📋 TL;DR
CVE-2020-28884 is an OS command injection vulnerability in Liferay Portal Server that allows authenticated administrators to execute arbitrary operating system commands through Groovy script injection. This affects Liferay Portal Server versions 7.2.0 GA1 and 7.3.5 GA6. The developer disputes this as a vulnerability, considering it an intended feature for administrators.
💻 Affected Systems
- Liferay Portal Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise allowing attackers to execute arbitrary OS commands, access sensitive data, install malware, or pivot to other systems.
Likely Case
Privileged administrator account abuse leading to unauthorized command execution, data exfiltration, or system manipulation.
If Mitigated
Limited impact with proper access controls, monitoring, and administrator vetting in place.
🎯 Exploit Status
Exploitation requires administrator credentials. Public proof-of-concept demonstrates Groovy script injection to execute OS commands. The feature is documented in official Liferay documentation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None - Developer disputes this as a vulnerability
Vendor Advisory: None - Developer considers this a feature, not a vulnerability
Restart Required: No
Instructions:
No official patch available. The developer maintains this is an intended feature for administrators to run Groovy scripts via the script console.
🔧 Temporary Workarounds
Disable Script Console Access
allRestrict or disable access to the script console feature for all administrator accounts.
Modify portal-ext.properties: script.console.enabled=false
Update role permissions to remove script console access
Implement Least Privilege Access
allCreate separate administrator roles without script console access for routine administration tasks.
Create custom roles in Control Panel > Users > Roles
Assign minimal necessary permissions to each role
🧯 If You Can't Patch
- Implement strict access controls and monitoring for administrator accounts
- Regularly audit administrator activities and script console usage
🔍 How to Verify
Check if Vulnerable:
Check if you have Liferay Portal Server version 7.2.0 GA1 or 7.3.5 GA6 and verify if administrator accounts have access to the script console feature.Check Version:
Check Liferay Control Panel > Server Administration > Properties, or examine liferay-portal.xml version informationVerify Fix Applied:
Verify that script console access is disabled or restricted, and test that administrator accounts cannot execute arbitrary OS commands through Groovy scripts.📡 Detection & Monitoring
Log Indicators:
- Unusual Groovy script execution in Liferay logs
- Script console access from unexpected administrator accounts
- OS command execution patterns in system logs
Network Indicators:
- Outbound connections from Liferay server to unexpected destinations following script execution
SIEM Query:
source="liferay.log" AND ("script console" OR "groovy" OR "Runtime.exec") AND (administrator_user_activity)🔗 References
- https://learn.liferay.com/dxp/latest/en/system-administration/using-the-script-engine/running-scripts-from-the-script-console.html
- https://medium.com/%40tranpdanh/some-way-to-execute-os-command-in-liferay-portal-84498bde18d3
- https://learn.liferay.com/dxp/latest/en/system-administration/using-the-script-engine/running-scripts-from-the-script-console.html
- https://medium.com/%40tranpdanh/some-way-to-execute-os-command-in-liferay-portal-84498bde18d3
