CVE-2020-23262
📋 TL;DR
CVE-2020-23262 is an unauthenticated SQL injection vulnerability in ming-soft MCMS v5.0 that allows attackers to execute arbitrary SQL commands without authentication through the /mcms/view.do endpoint. This affects all deployments of MCMS v5.0 that expose the vulnerable endpoint. Attackers can potentially access, modify, or delete database content.
💻 Affected Systems
- ming-soft MCMS
📦 What is this software?
Mcms by Mingsoft
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data destruction, or full system takeover via SQL injection to RCE chaining.
Likely Case
Database information disclosure, data manipulation, or authentication bypass leading to unauthorized access.
If Mitigated
Limited impact if proper input validation, parameterized queries, and WAF rules are in place.
🎯 Exploit Status
Exploitation requires no authentication and uses standard SQL injection techniques. Public GitHub issues demonstrate the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v5.1 or later
Vendor Advisory: https://github.com/ming-soft/MCMS/issues/45
Restart Required: Yes
Instructions:
1. Backup database and application files. 2. Upgrade to MCMS v5.1 or later. 3. Restart the application server. 4. Verify the /mcms/view.do endpoint is no longer vulnerable.
🔧 Temporary Workarounds
WAF Rule Implementation
allDeploy web application firewall rules to block SQL injection patterns targeting /mcms/view.do
# Example ModSecurity rule: SecRule REQUEST_URI "@streq /mcms/view.do" "id:1001,phase:2,deny,status:403,msg:'Blocking MCMS SQLi attempt'"
# Add SQL injection detection patterns specific to this endpoint
Endpoint Restriction
allBlock or restrict access to the vulnerable /mcms/view.do endpoint
# Apache: <Location /mcms/view.do> Order deny,allow Deny from all </Location>
# Nginx: location /mcms/view.do { deny all; }
# IIS: Add request filtering rule to block /mcms/view.do
🧯 If You Can't Patch
- Implement strict input validation and parameterized queries for all database operations
- Deploy network segmentation and restrict database access to only necessary application servers
🔍 How to Verify
Check if Vulnerable:
Test the /mcms/view.do endpoint with SQL injection payloads (e.g., ' OR '1'='1) and observe database errors or unexpected behavior.Check Version:
Check MCMS version in application configuration files or admin interface. Typically in /WEB-INF/classes/config.properties or similar.Verify Fix Applied:
After patching, attempt SQL injection against /mcms/view.do and verify proper error handling or rejection of malicious input.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL syntax in request parameters to /mcms/view.do
- Database error messages in application logs
- Multiple rapid requests to /mcms/view.do with varying parameters
Network Indicators:
- SQL keywords (SELECT, UNION, etc.) in HTTP requests to /mcms/view.do
- Abnormal response patterns from the endpoint
SIEM Query:
source="web_logs" AND uri="/mcms/view.do" AND (request CONTAINS "' OR" OR request CONTAINS "UNION" OR request CONTAINS "SELECT" OR request CONTAINS "--")