CVE-2019-9918
📋 TL;DR
CVE-2019-9918 is a SQL injection vulnerability in the Harmis JE Messenger component for Joomla! that allows attackers to execute arbitrary SQL statements in the database. This affects Joomla! websites using JE Messenger version 1.2.2, potentially leading to data theft, modification, or complete system compromise.
💻 Affected Systems
- Harmis JE Messenger for Joomla!
📦 What is this software?
Je Messenger by Harmistechnology
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise allowing data exfiltration, privilege escalation, and potential remote code execution through database functions.
Likely Case
Unauthorized data access, modification, or deletion of sensitive information stored in the database.
If Mitigated
Limited impact with proper input validation and parameterized queries preventing SQL injection.
🎯 Exploit Status
SQL injection vulnerabilities are commonly exploited with readily available tools and techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.3 or later
Vendor Advisory: https://extensions.joomla.org/extension/je-messenger/
Restart Required: No
Instructions:
1. Log into Joomla! admin panel. 2. Navigate to Extensions > Manage > Update. 3. Update JE Messenger to version 1.2.3 or later. 4. Alternatively, download latest version from Joomla! extensions site and install manually.
🔧 Temporary Workarounds
Disable JE Messenger Component
allTemporarily disable the vulnerable component until patching is possible.
Navigate to Extensions > Manage > Manage in Joomla! admin, find JE Messenger, and disable it.
Web Application Firewall Rules
allImplement WAF rules to block SQL injection patterns targeting JE Messenger endpoints.
Configure WAF to block requests containing SQL injection patterns to /index.php?option=com_jemessenger
🧯 If You Can't Patch
- Remove JE Messenger component entirely from the Joomla! installation.
- Implement network segmentation to restrict access to affected systems and monitor for suspicious database queries.
🔍 How to Verify
Check if Vulnerable:
Check Joomla! extensions manager for JE Messenger version. If version is 1.2.2, system is vulnerable.Check Version:
Check via Joomla! admin panel: Extensions > Manage > Manage, find JE Messenger and check version.Verify Fix Applied:
Confirm JE Messenger version is 1.2.3 or later in extensions manager.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts or SQL errors in Joomla! logs
- Requests to /index.php?option=com_jemessenger with SQL-like parameters
Network Indicators:
- Unusual outbound database connections from web server
- SQL injection patterns in HTTP requests
SIEM Query:
source="web_logs" AND (uri="*com_jemessenger*" AND (param="*UNION*" OR param="*SELECT*" OR param="*INSERT*" OR param="*DELETE*" OR param="*' OR '1'='1*"))