CVE-2021-43679
📋 TL;DR
CVE-2021-43679 is a critical SQL injection vulnerability in ECShop v2.7.3's API client component that allows attackers to execute arbitrary SQL commands. This affects all ECShop v2.7.3 installations using the vulnerable api.php file. Attackers can potentially access, modify, or delete database content through this vulnerability.
💻 Affected Systems
- ECShop
📦 What is this software?
Ecshop by Shopex
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data destruction, authentication bypass, and potential remote code execution through database functions.
Likely Case
Unauthorized data access and extraction, including sensitive customer information, order data, and administrative credentials.
If Mitigated
Limited impact with proper input validation, parameterized queries, and database user privilege restrictions in place.
🎯 Exploit Status
SQL injection vulnerabilities are commonly exploited and weaponized. The vulnerability is in a publicly accessible API endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.7.4 or later
Vendor Advisory: https://github.com/shopex/ecshop/issues/4
Restart Required: No
Instructions:
1. Upgrade to ECShop v2.7.4 or later. 2. Replace the vulnerable api.php file with the patched version. 3. Verify all SQL queries use parameterized statements.
🔧 Temporary Workarounds
Input Validation Filter
allAdd input validation and sanitization to the vulnerable API endpoint parameters
# Add parameter validation in api.php
# Example: filter_input(INPUT_GET, 'parameter', FILTER_SANITIZE_STRING);
WAF Rule Implementation
allDeploy web application firewall rules to block SQL injection patterns
# Example ModSecurity rule:
# SecRule ARGS "@detectSQLi" "id:1001,phase:2,deny,status:403"
🧯 If You Can't Patch
- Implement strict input validation and parameterized queries in the vulnerable api.php file
- Restrict access to the API endpoint using IP whitelisting or authentication requirements
🔍 How to Verify
Check if Vulnerable:
Check if api.php exists at shopex/ecshop/upload/api/client/api.php and verify the version is 2.7.3Check Version:
Check ECShop configuration files or admin panel for version informationVerify Fix Applied:
Verify the api.php file has been updated with parameterized queries and input validation, or confirm ECShop version is 2.7.4+📡 Detection & Monitoring
Log Indicators:
- Unusual SQL error messages in application logs
- Multiple failed SQL query attempts
- Suspicious parameter values in API requests
Network Indicators:
- Unusual database connection patterns
- Large data transfers from database server
- SQL injection patterns in HTTP requests
SIEM Query:
source="web_logs" AND ("sql syntax" OR "sql error" OR "union select" OR "sleep(") AND uri="*/api/client/api.php"