CVE-2021-31632
📋 TL;DR
CVE-2021-31632 is a critical SQL injection vulnerability in b2evolution CMS v7.2.3 that allows attackers to execute arbitrary SQL commands via the cfqueryparam parameter in the user login section. This affects all b2evolution CMS installations running the vulnerable version, potentially compromising the entire application and underlying database.
💻 Affected Systems
- b2evolution CMS
📦 What is this software?
B2evolution Cms by B2evolution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise including database takeover, data exfiltration, privilege escalation to admin, and potential remote code execution on the server.
Likely Case
Database compromise leading to credential theft, data manipulation, and potential lateral movement within the network.
If Mitigated
Limited impact with proper input validation and parameterized queries preventing successful exploitation.
🎯 Exploit Status
Exploitation requires access to the login functionality but doesn't require valid credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v7.2.4 and later
Vendor Advisory: https://b2evolution.net/downloads/7-2-stable.html
Restart Required: No
Instructions:
1. Backup your database and files. 2. Download b2evolution v7.2.4 or later from official site. 3. Replace all files except /conf and /media directories. 4. Run the upgrade script if prompted.
🔧 Temporary Workarounds
Input Validation Filter
allAdd custom input validation to sanitize cfqueryparam input before processing
Add input sanitization in login.php before SQL execution
Web Application Firewall
allDeploy WAF with SQL injection protection rules
Configure WAF to block SQL injection patterns in login requests
🧯 If You Can't Patch
- Implement network segmentation to isolate the CMS from critical systems
- Enable detailed logging and monitoring for SQL injection attempts
🔍 How to Verify
Check if Vulnerable:
Check if running b2evolution version 7.2.3 by examining version files or admin panelCheck Version:
Check /conf/_application.php or admin panel for version informationVerify Fix Applied:
Verify installation shows version 7.2.4 or later and test login functionality📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in application logs
- Multiple failed login attempts with SQL syntax
Network Indicators:
- HTTP POST requests to login.php with SQL keywords in parameters
SIEM Query:
source="web_logs" AND uri="/login.php" AND (param="cfqueryparam" AND value CONTAINS "UNION" OR "SELECT" OR "INSERT" OR "DELETE")