CVE-2022-27423
📋 TL;DR
This SQL injection vulnerability in Chamilo LMS allows attackers to execute arbitrary SQL commands via the blog_id parameter. Attackers can potentially access, modify, or delete database content. All users running vulnerable versions of Chamilo LMS are affected.
💻 Affected Systems
- Chamilo LMS
📦 What is this software?
Chamilo Lms by Chamilo
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, privilege escalation, and potential remote code execution via database functions.
Likely Case
Unauthorized data access, user information theft, and potential authentication bypass.
If Mitigated
Limited impact with proper input validation and database permissions, potentially only error messages or partial data exposure.
🎯 Exploit Status
SQL injection via GET parameter requires minimal technical skill to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.11.14 or later
Vendor Advisory: https://support.chamilo.org/projects/1/wiki/Security_issues
Restart Required: No
Instructions:
1. Backup your Chamilo installation and database. 2. Download the latest version from the official Chamilo website. 3. Replace vulnerable files with patched versions. 4. Verify the fix by testing the blog.php endpoint.
🔧 Temporary Workarounds
Disable Blog Module
linuxTemporarily disable the vulnerable blog module to prevent exploitation.
mv /path/to/chamilo/blog/blog.php /path/to/chamilo/blog/blog.php.disabled
Web Application Firewall Rule
allBlock malicious requests containing SQL injection patterns targeting blog_id parameter.
🧯 If You Can't Patch
- Implement strict input validation for blog_id parameter to only accept numeric values.
- Apply database-level controls: use least privilege accounts, enable query logging, and implement database firewall rules.
🔍 How to Verify
Check if Vulnerable:
Test the /blog/blog.php endpoint with SQL injection payloads in blog_id parameter (e.g., blog_id=1' OR '1'='1).Check Version:
Check the main/inc/conf/configuration.php file for version information or use the Chamilo admin panel.Verify Fix Applied:
Verify the patched version no longer accepts malicious SQL in blog_id parameter and returns proper error handling.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL errors in application logs
- Multiple requests to /blog/blog.php with unusual parameters
- Database queries containing UNION, SELECT, or other SQL keywords from blog.php
Network Indicators:
- HTTP requests to /blog/blog.php with SQL injection patterns in parameters
- Unusual database connection patterns from web server
SIEM Query:
source="web_logs" AND uri_path="/blog/blog.php" AND (param="*blog_id=*'*" OR param="*blog_id=*%27*")