CVE-2020-28102
📋 TL;DR
CVE-2020-28102 is a critical SQL injection vulnerability in cscms v4.1 that allows attackers to execute arbitrary SQL commands via the 'js_del' function. This affects all deployments running cscms v4.1, potentially compromising database integrity and confidentiality. Attackers can manipulate SQL queries to access, modify, or delete sensitive data.
💻 Affected Systems
- cscms
📦 What is this software?
Cscms by Chshcms
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including data theft, data destruction, and potential remote code execution through database functions.
Likely Case
Unauthorized data access and manipulation, potentially leading to credential theft, privilege escalation, and data corruption.
If Mitigated
Limited impact with proper input validation and parameterized queries in place, though underlying vulnerability remains.
🎯 Exploit Status
SQL injection via js_del function requires some level of access but is straightforward to exploit once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v4.2 or later
Vendor Advisory: https://github.com/chshcms/cscms/issues/9
Restart Required: Yes
Instructions:
1. Backup current installation and database. 2. Download latest version from official repository. 3. Replace vulnerable files with patched version. 4. Restart web server. 5. Verify functionality.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation for js_del parameter to block SQL injection attempts
Modify js_del function to sanitize input using parameterized queries
WAF Rule Implementation
allDeploy web application firewall rules to detect and block SQL injection patterns
Configure WAF to block requests containing SQL keywords in js_del parameter
🧯 If You Can't Patch
- Implement network segmentation to isolate cscms from critical systems
- Enable detailed logging and monitoring for SQL injection attempts
🔍 How to Verify
Check if Vulnerable:
Check if running cscms v4.1 by examining version files or admin panelCheck Version:
Check cscms version in admin panel or examine version.txt fileVerify Fix Applied:
Verify version is v4.2 or later and test js_del function with SQL injection test payloads📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts
- Unexpected database operations
Network Indicators:
- HTTP requests with SQL keywords in js_del parameter
- Abnormal database connection patterns
SIEM Query:
source="web_logs" AND (js_del CONTAINS "UNION" OR js_del CONTAINS "SELECT" OR js_del CONTAINS "INSERT")