CVE-2021-37787
📋 TL;DR
This SQL injection vulnerability in ABO.CMS allows attackers to execute arbitrary SQL commands through the unprivileged administrative interface via HTTP POST requests to the TinyMCE module. It affects ABO.CMS versions 5.8 through 5.9.3, potentially compromising database integrity and exposing sensitive information.
💻 Affected Systems
- ABO.CMS
📦 What is this software?
Abo.cms by Abocms
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including data exfiltration, modification, or deletion; potential privilege escalation to administrative access; possible remote code execution if database configuration permits.
Likely Case
Unauthorized data access and extraction from the CMS database, including user credentials, content, and configuration data.
If Mitigated
Limited impact with proper input validation and parameterized queries in place, potentially only causing application errors.
🎯 Exploit Status
Exploitation requires access to the administrative interface but does not require administrative privileges.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 5.9.4 or later
Vendor Advisory: https://www.abocms.ru/
Restart Required: No
Instructions:
1. Backup your ABO.CMS installation and database. 2. Download the latest version from the official ABO.CMS website. 3. Replace affected files with patched versions. 4. Verify the installation works correctly.
🔧 Temporary Workarounds
Disable TinyMCE Module
allTemporarily disable the vulnerable TinyMCE module to prevent exploitation.
Edit ABO.CMS configuration to disable TinyMCE module
Implement WAF Rules
allAdd web application firewall rules to block SQL injection patterns targeting the TinyMCE endpoint.
Configure WAF to block SQL injection patterns to /admin/tinymce/ endpoints
🧯 If You Can't Patch
- Restrict access to the administrative interface using network segmentation and IP whitelisting.
- Implement input validation and parameterized queries for all TinyMCE-related database operations.
🔍 How to Verify
Check if Vulnerable:
Check if your ABO.CMS version is between 5.8 and 5.9.3 inclusive, and verify if the TinyMCE module is accessible via the administrative interface.Check Version:
Check ABO.CMS admin panel or configuration files for version information.Verify Fix Applied:
Confirm ABO.CMS version is 5.9.4 or later, and test that SQL injection attempts against the TinyMCE endpoint no longer succeed.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple POST requests to /admin/tinymce/ endpoints with SQL syntax
Network Indicators:
- HTTP POST requests to administrative interface containing SQL injection patterns
SIEM Query:
source="web_logs" AND (uri_path="/admin/tinymce/" AND method="POST") AND (content CONTAINS "UNION" OR content CONTAINS "SELECT" OR content CONTAINS "INSERT" OR content CONTAINS "DELETE")