CVE-2020-20975
📋 TL;DR
This is a SQL injection vulnerability in Gxlcms v1.1 that allows attackers to execute arbitrary SQL commands via the $filename parameter in the dataaction.class.php file. It affects all installations of Gxlcms v1.1, potentially compromising the entire database and application.
💻 Affected Systems
- Gxlcms
📦 What is this software?
Gxlcms by Gxlcms
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data manipulation, authentication bypass, and potential remote code execution via database functions.
Likely Case
Database information disclosure, data manipulation, and potential privilege escalation within the application.
If Mitigated
Limited impact if proper input validation and parameterized queries are implemented, though some risk remains.
🎯 Exploit Status
SQL injection vulnerabilities are commonly exploited and public proof-of-concept exists. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
1. Check for official patch from Gxlcms developers
2. If no patch available, implement manual fixes or upgrade to newer version
3. Apply input validation and parameterized queries to affected file
🔧 Temporary Workarounds
Input Validation and Sanitization
allAdd input validation and sanitization to the $filename parameter in dataaction.class.php
Edit \lib\admin\action\dataaction.class.php and add input validation for $filename parameter
Web Application Firewall (WAF)
allDeploy WAF rules to block SQL injection attempts
Configure WAF to block SQL injection patterns in filename parameters
🧯 If You Can't Patch
- Isolate the vulnerable system from the internet and restrict access to trusted networks only
- Implement strict input validation at the application level and monitor for SQL injection attempts
🔍 How to Verify
Check if Vulnerable:
Check if Gxlcms version is 1.1 and examine \lib\admin\action\dataaction.class.php for lack of input validation on $filename parameterCheck Version:
Check Gxlcms configuration files or admin panel for version informationVerify Fix Applied:
Test the $filename parameter with SQL injection payloads to ensure they are properly sanitized or blocked📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts after SQL injection attempts
- Unexpected file operations in application logs
Network Indicators:
- SQL injection patterns in HTTP requests to dataaction.class.php
- Unusual database connection patterns
SIEM Query:
source="web_logs" AND (url="*dataaction.class.php*" AND (param="*filename=*' OR *" OR param="*filename=*;--*"))