CVE-2021-41754
📋 TL;DR
CVE-2021-41754 is a SQL injection vulnerability in dynamicMarkt software that allows attackers to execute arbitrary SQL commands through the parent parameter in index.php. This affects all users running dynamicMarkt version 3.10 or earlier. Successful exploitation could lead to data theft, modification, or complete system compromise.
💻 Affected Systems
- dynamicMarkt
📦 What is this software?
Dynamicmarkt by Dynamicvision
⚠️ Risk & Real-World Impact
Worst Case
Full database compromise allowing data exfiltration, modification, or deletion; potential remote code execution if database permissions allow; complete system takeover.
Likely Case
Unauthorized database access leading to sensitive data exposure (user credentials, personal information, financial data).
If Mitigated
Limited impact with proper input validation, parameterized queries, and database user privilege restrictions.
🎯 Exploit Status
Public PoC available on GitHub. Exploitation requires minimal technical skill due to simple SQL injection vector.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available, or implement workarounds.
🔧 Temporary Workarounds
Input Validation Filter
allAdd input validation to sanitize the parent parameter before processing
Modify index.php to add: $parent = filter_var($_GET['parent'], FILTER_SANITIZE_NUMBER_INT);
Web Application Firewall Rule
allBlock SQL injection patterns in the parent parameter
Add WAF rule: SecRule ARGS:parent "@detectSQLi" "id:1001,phase:2,deny,status:403"
🧯 If You Can't Patch
- Implement network segmentation to isolate dynamicMarkt from critical systems
- Enable detailed logging and monitoring for SQL injection attempts
🔍 How to Verify
Check if Vulnerable:
Test by sending SQL injection payloads to the parent parameter: /index.php?parent=1' OR '1'='1Check Version:
Check dynamicMarkt version in admin panel or configuration filesVerify Fix Applied:
Test with same payloads after implementing fixes; should return error or sanitized response📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts following SQL injection patterns
- Requests with SQL keywords in parent parameter
Network Indicators:
- HTTP requests containing SQL injection patterns in URL parameters
- Unusual database traffic from web server
SIEM Query:
source="web_logs" AND (url="*parent=*' OR*" OR url="*parent=*' UNION*" OR url="*parent=*' SELECT*")🔗 References
- https://github.com/blockomat2100/PoCs/blob/main/dynamicMarkt/vulns.md
- https://www.heise.de/download/product/dynamicmarkt-3.10-marktplatz-software-90441
- https://github.com/blockomat2100/PoCs/blob/main/dynamicMarkt/vulns.md
- https://www.heise.de/download/product/dynamicmarkt-3.10-marktplatz-software-90441
