CVE-2021-41947
📋 TL;DR
This SQL injection vulnerability in Subrion CMS v4.2.1 allows attackers to execute arbitrary SQL commands through the visual-mode interface. It affects all Subrion CMS installations running version 4.2.1 that have the visual-mode feature enabled. Attackers could potentially access, modify, or delete database content.
💻 Affected Systems
- Subrion CMS
📦 What is this software?
Subrion Cms by Intelliants
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data destruction, authentication bypass, or remote code execution if database functions allow it.
Likely Case
Unauthorized database access allowing data extraction, modification of content, or privilege escalation within the CMS.
If Mitigated
Limited impact with proper input validation, parameterized queries, and database user privilege restrictions in place.
🎯 Exploit Status
SQL injection vulnerabilities are commonly exploited with automated tools. Proof of concept exists in public repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 4.2.2 or later
Vendor Advisory: https://github.com/intelliants/subrion/issues/887
Restart Required: No
Instructions:
1. Backup your Subrion CMS installation and database. 2. Download the latest version from the official Subrion repository. 3. Replace affected files with patched versions. 4. Verify the visual-mode functionality works correctly.
🔧 Temporary Workarounds
Disable Visual-Mode Feature
allTemporarily disable the visual-mode feature to prevent exploitation while planning for patching.
Modify configuration to disable visual-mode access or restrict it to trusted users only
Web Application Firewall Rules
allImplement WAF rules to block SQL injection patterns targeting the visual-mode endpoint.
Add WAF rules to detect and block SQL injection attempts in POST/GET parameters
🧯 If You Can't Patch
- Implement strict input validation and parameterized queries for all visual-mode database interactions
- Restrict database user permissions to minimum required (SELECT only if possible, no DROP, INSERT, UPDATE)
🔍 How to Verify
Check if Vulnerable:
Check if running Subrion CMS version 4.2.1 and test visual-mode functionality with SQL injection payloads in a controlled environment.Check Version:
Check Subrion CMS admin panel or examine version files in the installation directoryVerify Fix Applied:
After updating, verify version is 4.2.2 or later and test that SQL injection attempts in visual-mode are properly sanitized/blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual database queries from web application logs
- SQL syntax errors in application logs
- Multiple failed login attempts or unusual parameter values
Network Indicators:
- SQL keywords in HTTP requests to visual-mode endpoints
- Unusual database connection patterns
SIEM Query:
web_requests WHERE url CONTAINS 'visual-mode' AND (params CONTAINS 'UNION' OR params CONTAINS 'SELECT' OR params CONTAINS 'INSERT' OR params CONTAINS 'DELETE')