CVE-2020-5680
📋 TL;DR
This vulnerability in EC-CUBE e-commerce software allows remote attackers to cause denial-of-service conditions through improper input validation. It affects EC-CUBE installations from version 3.0.5 through 3.0.18. Attackers can exploit this without authentication to disrupt service availability.
💻 Affected Systems
- EC-CUBE
📦 What is this software?
Ec Cube by Ec Cube
⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability, making the e-commerce platform inaccessible to customers and administrators, potentially causing significant business disruption and revenue loss.
Likely Case
Temporary service degradation or intermittent outages affecting customer transactions and administrative functions.
If Mitigated
Minimal impact with proper input validation and rate limiting in place, potentially causing only minor performance degradation.
🎯 Exploit Status
The vulnerability requires unspecified input vectors but is unauthenticated and likely simple to exploit given the low complexity rating.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.0.19
Vendor Advisory: https://www.ec-cube.net/info/weakness/
Restart Required: Yes
Instructions:
1. Backup your EC-CUBE installation and database. 2. Download EC-CUBE 3.0.19 or later from the official website. 3. Follow the EC-CUBE upgrade procedure as documented in the official upgrade guide. 4. Restart your web server and verify the upgrade was successful.
🔧 Temporary Workarounds
Input Validation Filtering
allImplement custom input validation filters to sanitize all user inputs before processing.
Rate Limiting
allConfigure web server or application rate limiting to prevent DoS attempts.
🧯 If You Can't Patch
- Implement strict input validation at the web application firewall (WAF) level
- Deploy rate limiting and DoS protection services in front of the application
🔍 How to Verify
Check if Vulnerable:
Check your EC-CUBE version by viewing the admin panel or checking the EC-CUBE configuration files. If version is between 3.0.5 and 3.0.18 inclusive, you are vulnerable.Check Version:
Check EC-CUBE version in admin panel or examine app/config/eccube/config.phpVerify Fix Applied:
After upgrading, verify the version shows 3.0.19 or higher in the admin panel and test application functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual patterns of malformed requests
- Repeated failed requests from single IPs
- Sudden spikes in error logs
Network Indicators:
- Abnormal request patterns to EC-CUBE endpoints
- High volume of requests from single sources
SIEM Query:
source="web_server_logs" AND (url_path="*ec-cube*" OR app="EC-CUBE") AND (status_code="400" OR status_code="500") | stats count by src_ip