CVE-2021-45255
📋 TL;DR
This CVE describes a critical SQL injection vulnerability in Video Sharing Website 1.0's ajax.php email parameter. Attackers can execute arbitrary SQL commands, potentially leading to data theft, authentication bypass, or remote code execution via UNC path injection. Any organization using this specific software version is affected.
💻 Affected Systems
- Video Sharing Website
📦 What is this software?
Video Sharing Website by Video Sharing Website Project
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the database server leading to data exfiltration, authentication bypass, and potential remote code execution via UNC path injection to attacker-controlled servers.
Likely Case
Database information disclosure, including user credentials and sensitive data, with potential for authentication bypass and limited remote code execution.
If Mitigated
Limited impact if proper input validation and parameterized queries are implemented, though database access may still be compromised.
🎯 Exploit Status
The exploit uses standard SQL injection techniques with UNC path injection for potential remote code execution. Public proof-of-concept code is available in GitHub repositories.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch is available. Consider implementing parameterized queries and input validation in ajax.php, specifically for the email parameter.
🔧 Temporary Workarounds
Implement Input Validation
allAdd server-side validation to reject malicious input in the email parameter
Edit ajax.php to validate email format and reject SQL keywords
Web Application Firewall Rules
allDeploy WAF rules to block SQL injection attempts
Configure WAF to detect and block SQL injection patterns in POST parameters
🧯 If You Can't Patch
- Isolate the vulnerable system from the internet and restrict network access
- Implement strict network monitoring for SQL injection attempts and UNC path requests
🔍 How to Verify
Check if Vulnerable:
Test the email parameter in ajax.php with SQL injection payloads like ' OR '1'='1Check Version:
Check the software version in configuration files or admin panelVerify Fix Applied:
Verify that SQL injection attempts no longer succeed and input validation is properly implemented📡 Detection & Monitoring
Log Indicators:
- Unusual SQL error messages in application logs
- Multiple failed login attempts with SQL injection patterns
- UNC path requests in web server logs
Network Indicators:
- Outbound SMB requests from web server to external domains
- Unusual database query patterns
SIEM Query:
source="web_logs" AND ("sql" OR "union" OR "select" OR "load_file") AND dest_ip="database_server"