CVE-2020-35613
📋 TL;DR
This SQL injection vulnerability in Joomla's backend user list allows authenticated attackers to execute arbitrary SQL commands. It affects Joomla installations from version 3.0.0 through 3.9.22. Attackers with backend access can potentially extract, modify, or delete database content.
💻 Affected Systems
- Joomla
📦 What is this software?
Joomla\! by Joomla
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, privilege escalation, or complete system takeover via subsequent attacks.
Likely Case
Unauthorized data access, user credential theft, and potential privilege escalation within the Joomla application.
If Mitigated
Limited impact with proper access controls, though SQL injection remains a serious vulnerability.
🎯 Exploit Status
Exploitation requires authenticated backend access. SQL injection techniques are well-documented and weaponization is likely.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.9.23
Vendor Advisory: https://developer.joomla.org/security-centre/831-20201104-core-sql-injection-in-com-users-list-view.html
Restart Required: No
Instructions:
1. Backup your Joomla installation and database. 2. Update Joomla to version 3.9.23 or later via the Joomla Update component. 3. Verify the update completed successfully.
🔧 Temporary Workarounds
Restrict Backend Access
allLimit backend access to trusted IP addresses only
# Configure web server (Apache example) to restrict /administrator access
<Location /administrator>
Order deny,allow
Deny from all
Allow from 192.168.1.0/24
</Location>
🧯 If You Can't Patch
- Implement strict input validation and parameterized queries for all user inputs
- Apply web application firewall rules to block SQL injection patterns
🔍 How to Verify
Check if Vulnerable:
Check Joomla version in System Information or via version.php file. If version is between 3.0.0 and 3.9.22, system is vulnerable.Check Version:
grep -i 'RELEASE' /path/to/joomla/administrator/manifests/files/joomla.xml | head -1Verify Fix Applied:
Verify Joomla version is 3.9.23 or later. Check that the patch has been applied by reviewing the changelog.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts followed by backend access
- Suspicious user agent strings in access logs
Network Indicators:
- SQL injection patterns in HTTP requests to /administrator
- Unusual database connection patterns from web server
SIEM Query:
source="web_logs" AND uri="/administrator/*" AND (query="*SELECT*" OR query="*UNION*" OR query="*INSERT*" OR query="*UPDATE*")