CVE-2023-31941
📋 TL;DR
This vulnerability allows remote attackers to upload malicious PHP files to an Online Travel Agency System v1.0 via the employee_insert.php endpoint. Successful exploitation enables arbitrary code execution on the web server, potentially compromising the entire system. Organizations using this specific travel agency software version are affected.
💻 Affected Systems
- Online Travel Agency System
📦 What is this software?
Online Travel Agency System by Online Travel Agency System Project
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise leading to data theft, ransomware deployment, lateral movement to internal networks, and complete system takeover.
Likely Case
Webshell installation allowing persistent backdoor access, data exfiltration, and further exploitation of the server environment.
If Mitigated
File upload blocked or malicious files quarantined with minimal to no impact on system integrity.
🎯 Exploit Status
Simple file upload bypass with publicly available proof-of-concept; trivial for attackers with basic web exploitation knowledge.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider replacing with secure alternative software or implementing workarounds.
🔧 Temporary Workarounds
Restrict file upload extensions
allConfigure web server or application to block PHP file uploads
# In .htaccess for Apache:
<FilesMatch "\.(php|php3|php4|php5|phtml|phar)$">
Order Allow,Deny
Deny from all
</FilesMatch>
# In nginx config:
location ~ \.php$ {
deny all;
}
Disable employee_insert.php endpoint
linuxRemove or restrict access to vulnerable file upload endpoint
# Rename or move file:
mv employee_insert.php employee_insert.php.disabled
# Or set restrictive permissions:
chmod 000 employee_insert.php
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block PHP file uploads to employee_insert.php
- Monitor file upload directories for suspicious PHP files and implement file integrity monitoring
🔍 How to Verify
Check if Vulnerable:
Attempt to upload a PHP file to the employee_insert.php endpoint; if successful without proper validation, system is vulnerable.Check Version:
Check application documentation or source code for version information; typically found in README files or configuration files.Verify Fix Applied:
Test that PHP file uploads are rejected with appropriate error messages and no files are saved to upload directories.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to employee_insert.php with .php file extensions in uploads
- File creation events in upload directories with .php extension
- Unusual process execution from web upload directories
Network Indicators:
- Unusual outbound connections from web server following file uploads
- HTTP requests downloading additional payloads after initial upload
SIEM Query:
source="web_logs" AND uri="/employee_insert.php" AND method="POST" AND file_extension="php"