CVE-2020-19853
📋 TL;DR
BlueCMS v1.6 contains a SQL injection vulnerability in the /ad_js.php endpoint that allows attackers to execute arbitrary SQL commands. This affects all users running BlueCMS v1.6, potentially compromising the entire database and application. Attackers can exploit this without authentication to steal, modify, or delete data.
💻 Affected Systems
- BlueCMS
📦 What is this software?
Bluecms by Bluecms Project
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data destruction, remote code execution via database functions, and full system takeover.
Likely Case
Database information disclosure, credential theft, privilege escalation, and data manipulation.
If Mitigated
Limited impact with proper input validation, parameterized queries, and web application firewall rules blocking SQL injection patterns.
🎯 Exploit Status
The vulnerability is in a publicly accessible endpoint with no authentication required, making exploitation trivial for attackers with basic SQL injection knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
1. Check if BlueCMS is still maintained. 2. If maintained, upgrade to latest version. 3. If not maintained, consider migrating to alternative CMS. 4. Manually patch /ad_js.php to use parameterized queries or input validation.
🔧 Temporary Workarounds
Web Application Firewall Rule
allBlock SQL injection patterns targeting /ad_js.php endpoint
WAF specific - configure rule to block requests containing SQL keywords like UNION, SELECT, INSERT, DELETE, DROP, OR 1=1 when targeting /ad_js.php
Input Validation Patch
allAdd input validation to sanitize parameters in ad_js.php
Edit ad_js.php and add parameter validation: $id = intval($_GET['id']); // Convert to integer
Use prepared statements for database queries
🧯 If You Can't Patch
- Block external access to /ad_js.php using firewall rules or web server configuration
- Implement network segmentation to isolate the BlueCMS instance from critical systems
🔍 How to Verify
Check if Vulnerable:
Test /ad_js.php endpoint with SQL injection payloads like: /ad_js.php?id=1' OR '1'='1Check Version:
Check BlueCMS version in admin panel or look for version information in source code filesVerify Fix Applied:
Test the same SQL injection payloads after patching - they should return error or no data instead of executing SQL📡 Detection & Monitoring
Log Indicators:
- Unusual SQL errors in application logs
- Multiple requests to /ad_js.php with SQL keywords
- Database query errors containing user input
Network Indicators:
- HTTP requests to /ad_js.php containing SQL injection patterns
- Unusual database traffic from web server
SIEM Query:
source="web_logs" AND uri="/ad_js.php" AND (query CONTAINS "UNION" OR query CONTAINS "SELECT" OR query CONTAINS "OR 1=1")