CVE-2020-21132
📋 TL;DR
This is a critical SQL injection vulnerability in Metinfo 7.0.0beta that allows attackers to execute arbitrary SQL commands through the index.php file. It affects all systems running the vulnerable version of this content management system. Successful exploitation could lead to complete compromise of the database and potentially the underlying server.
💻 Affected Systems
- Metinfo CMS
📦 What is this software?
Metinfo by Metinfo
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data manipulation, authentication bypass, and potential remote code execution through database functions.
Likely Case
Database information disclosure, data manipulation, and potential privilege escalation within the application.
If Mitigated
Limited impact with proper input validation and parameterized queries in place.
🎯 Exploit Status
SQL injection vulnerabilities in index.php files are commonly exploited. Public references show proof-of-concept details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Metinfo 7.0.0 stable or later versions
Vendor Advisory: https://www.metinfo.cn/
Restart Required: No
Instructions:
1. Upgrade to Metinfo 7.0.0 stable or later version. 2. Replace the vulnerable index.php file with the patched version. 3. Clear any cached files or templates.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation and filtering for all user-supplied parameters in index.php
# Add parameter validation before SQL queries
# Example: if(!preg_match('/^[a-zA-Z0-9_]+$/', $input)) { die('Invalid input'); }
WAF Rule Implementation
allDeploy web application firewall rules to block SQL injection patterns
# ModSecurity rule: SecRule ARGS "@detectSQLi" "id:1001,phase:2,deny,status:403"
🧯 If You Can't Patch
- Implement strict input validation and parameterized queries in the vulnerable code section
- Deploy a web application firewall (WAF) with SQL injection protection rules
🔍 How to Verify
Check if Vulnerable:
Check if running Metinfo 7.0.0beta by examining version files or admin panel. Test index.php with SQL injection payloads in controlled environment.Check Version:
Check /metinfo/include/version.php or admin panel for version informationVerify Fix Applied:
Verify version is updated to 7.0.0 stable or later. Test index.php with SQL injection payloads to confirm they are blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL error messages in logs
- Multiple failed login attempts with SQL syntax
- Long parameter values in index.php requests
Network Indicators:
- SQL keywords in HTTP GET/POST parameters to index.php
- Unusual database connection patterns from web server
SIEM Query:
source="web_logs" AND (uri="*/index.php*" AND (param CONTAINS "UNION" OR param CONTAINS "SELECT" OR param CONTAINS "INSERT"))