CVE-2023-40191
📋 TL;DR
This reflected cross-site scripting (XSS) vulnerability in Liferay Portal and DXP allows remote attackers to inject malicious scripts into the 'Blocked Email Domains' text field. When exploited, this can enable session hijacking, credential theft, or complete account takeover. Organizations running affected Liferay versions with internet-facing portals are at risk.
💻 Affected Systems
- Liferay Portal
- Liferay DXP
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete account compromise leading to administrative access, data exfiltration, or ransomware deployment across the Liferay environment.
Likely Case
Session hijacking allowing attackers to impersonate legitimate users, steal credentials, or perform unauthorized actions within the portal.
If Mitigated
Limited impact with proper input validation and output encoding, potentially reduced to minor UI disruption.
🎯 Exploit Status
Exploitation requires administrative access to the instance settings page, making it a post-authentication vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Liferay Portal 7.4.3.98+; Liferay DXP 2023.Q3 patch 6+; Liferay DXP 7.4 update 93+
Vendor Advisory: https://liferay.dev/portal/security/known-vulnerabilities/-/asset_publisher/jekt/content/cve-2023-40191
Restart Required: Yes
Instructions:
1. Download the appropriate patch from Liferay's customer portal. 2. Apply the patch following Liferay's patch installation guide. 3. Restart the Liferay server. 4. Verify the fix by checking the version.
🔧 Temporary Workarounds
Input Validation Filter
allImplement a servlet filter to sanitize input to the 'Blocked Email Domains' field
Implement custom filter in portal-ext.properties: auth.pipeline.pre=com.example.CustomXSSFilter
Access Restriction
allRestrict access to instance settings page to only essential administrators
Configure role-based access control in Control Panel > Users > Roles
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block XSS payloads in the 'Blocked Email Domains' parameter
- Disable or restrict the 'Blocked Email Domains' feature entirely through portal-ext.properties configuration
🔍 How to Verify
Check if Vulnerable:
Check Liferay version via Control Panel > Server Administration > Properties, or examine liferay-home/portal-ext.properties for version informationCheck Version:
Check ${liferay.home}/portal-ext.properties or Control Panel interfaceVerify Fix Applied:
Verify version is updated to patched version and test XSS payload in 'Blocked Email Domains' field to confirm sanitization📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /group/control_panel/manage containing script tags in parameters
- Multiple failed login attempts followed by access to instance settings
Network Indicators:
- HTTP requests with script payloads in 'blockedEmailDomains' parameter
- Unusual outbound connections after administrative access
SIEM Query:
source="liferay.log" AND ("blockedEmailDomains" AND ("<script" OR "javascript:" OR "onerror="))