CVE-2020-5777
📋 TL;DR
CVE-2020-5777 allows remote attackers to bypass authentication in MAGMI (Magento Mass Importer) by overwhelming database connections and exploiting default credentials. This affects MAGMI installations prior to version 0.7.24 that are exposed to untrusted networks. Attackers can gain administrative access without valid credentials.
💻 Affected Systems
- MAGMI (Magento Mass Importer)
📦 What is this software?
Magmi by Magmi Project
⚠️ Risk & Real-World Impact
Worst Case
Full administrative takeover of MAGMI interface leading to data manipulation, code execution, or complete Magento store compromise.
Likely Case
Unauthorized access to MAGMI functionality allowing import/export of product data, configuration changes, or data exfiltration.
If Mitigated
Authentication remains intact with proper connection limits and credential management.
🎯 Exploit Status
Exploit requires sending 151+ simultaneous requests to trigger database connection exhaustion, then using default credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.7.24
Vendor Advisory: https://github.com/dweeves/magmi-git/commit/3a9c7f8b599c0f46eeda4d46551b3c6c2e6d5b0e
Restart Required: No
Instructions:
1. Download MAGMI 0.7.24 or later from official repository. 2. Replace existing MAGMI installation files. 3. Verify default credentials are changed or disabled.
🔧 Temporary Workarounds
Increase MySQL max_connections
linuxSet MySQL max_connections higher than web server MaxRequestWorkers to prevent connection exhaustion.
SET GLOBAL max_connections = 300;
Add 'max_connections=300' to my.cnf
Change default credentials
allModify or remove default magmi:magmi credentials in MAGMI configuration.
Edit magmi/conf/magmi.ini and change credentials
🧯 If You Can't Patch
- Block external access to MAGMI interface using firewall rules or web server configuration.
- Implement rate limiting to prevent simultaneous connection attacks.
🔍 How to Verify
Check if Vulnerable:
Check MAGMI version in web interface or magmi/version.txt file. If version < 0.7.24 and accessible, assume vulnerable.Check Version:
cat magmi/version.txtVerify Fix Applied:
Confirm version is 0.7.24 or later and test authentication with default credentials (should fail).📡 Detection & Monitoring
Log Indicators:
- Multiple 'Too many connections' MySQL errors
- Authentication attempts with 'magmi' username
- Unusual MAGMI access patterns
Network Indicators:
- Burst of 150+ simultaneous requests to MAGMI endpoints
- Traffic to /magmi/web/magmi.php
SIEM Query:
source='apache' AND (uri='/magmi/*' AND status=401) OR (mysql_error='Too many connections')