CVE-2020-20296
📋 TL;DR
CVE-2020-20296 is a critical SQL injection vulnerability in CMSWing project version 1.3.8 that allows attackers to execute arbitrary SQL commands through the rechargeAction function. This affects all systems running the vulnerable version of CMSWing, potentially compromising database integrity and confidentiality.
💻 Affected Systems
- CMSWing
📦 What is this software?
Cmswing by Cmswing
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including data theft, data manipulation, privilege escalation, and potential remote code execution through database functions.
Likely Case
Unauthorized access to sensitive user data, financial transaction manipulation, and potential website defacement.
If Mitigated
Limited impact with proper input validation and parameterized queries preventing SQL injection.
🎯 Exploit Status
Exploitation requires access to the recharge functionality, which typically requires authentication. The vulnerability is well-documented in public GitHub issues.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 1.3.8
Vendor Advisory: https://github.com/arterli/CmsWing/issues/51
Restart Required: No
Instructions:
1. Upgrade CMSWing to the latest version. 2. Apply the fix from GitHub issue #51 if upgrading is not possible. 3. Review and test the application after patching.
🔧 Temporary Workarounds
Input Validation Workaround
allAdd server-side validation for the balance parameter in rechargeAction function
Modify rechargeAction function to validate balance parameter type and range
WAF Rule Implementation
allDeploy web application firewall rules to block SQL injection attempts
Configure WAF to detect and block SQL injection patterns in POST parameters
🧯 If You Can't Patch
- Implement network segmentation to isolate the vulnerable system from critical assets
- Deploy database monitoring to detect unusual SQL queries and access patterns
🔍 How to Verify
Check if Vulnerable:
Check if CMSWing version is 1.3.8 by examining version files or configurationCheck Version:
Check CMSWing version in configuration files or admin panelVerify Fix Applied:
Test the recharge functionality with SQL injection payloads to ensure they are blocked📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed recharge attempts with SQL-like parameters
- Database error messages containing SQL syntax
Network Indicators:
- HTTP POST requests to recharge endpoint with SQL injection payloads
- Unusual database connection patterns
SIEM Query:
source="web_logs" AND (url="*recharge*" AND (param="*balance*" AND value="*' OR *"))