CVE-2021-42185
📋 TL;DR
CVE-2021-42185 is a critical SQL injection vulnerability in wdja CMS v2.1 that allows attackers to execute arbitrary SQL commands through the foreground search function. This affects all systems running wdja v2.1, potentially leading to complete database compromise. Attackers can exploit this without authentication to steal, modify, or delete sensitive data.
💻 Affected Systems
- wdja CMS
📦 What is this software?
Wdja by Wdja
⚠️ Risk & Real-World Impact
Worst Case
Complete database takeover allowing data theft, modification, or deletion; potential remote code execution if database permissions allow; full system compromise.
Likely Case
Database information disclosure including user credentials, sensitive content, and configuration data; potential privilege escalation.
If Mitigated
Limited impact with proper input validation and parameterized queries; database access restricted to read-only operations.
🎯 Exploit Status
SQL injection in search function requires minimal technical skill to exploit. Public proof-of-concept available in GitHub references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Upgrade to a newer version of wdja if available, or apply manual fixes to sanitize search input.
🔧 Temporary Workarounds
Input Validation and Sanitization
allImplement strict input validation and parameterized queries for search functionality
Modify search.php to use prepared statements with parameter binding
WAF Rule Implementation
allDeploy web application firewall rules to block SQL injection patterns
Add WAF rule: deny requests containing SQL keywords like UNION, SELECT, INSERT in search parameters
🧯 If You Can't Patch
- Disable the vulnerable search functionality entirely
- Implement network segmentation to isolate the wdja instance from sensitive databases
🔍 How to Verify
Check if Vulnerable:
Test search function with SQL injection payloads like ' OR '1'='1 in search parametersCheck Version:
Check wdja version in admin panel or configuration filesVerify Fix Applied:
Verify that SQL injection payloads no longer execute and return error messages or sanitized results📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed login attempts following search requests
- Search parameters containing SQL keywords
Network Indicators:
- HTTP requests with SQL injection patterns in search parameters
- Unusual database connection patterns from web server
SIEM Query:
source="web_logs" AND (search_param="*UNION*" OR search_param="*SELECT*" OR search_param="*INSERT*")