CVE-2023-53971
📋 TL;DR
WebTareas 2.4 contains an authenticated file upload vulnerability that allows attackers to upload malicious PHP files and execute arbitrary code on the server. This affects all installations of WebTareas 2.4 with the vulnerable chat photo upload functionality enabled. Attackers need valid user credentials to exploit this vulnerability.
💻 Affected Systems
- WebTareas
📦 What is this software?
Webtareas by Webtareas Project
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, lateral movement, ransomware deployment, or persistent backdoor installation.
Likely Case
Unauthorized file upload leading to web shell installation, data exfiltration, or server takeover.
If Mitigated
Limited impact if file upload restrictions are properly implemented and web server permissions are correctly configured.
🎯 Exploit Status
Exploit code is publicly available on Exploit-DB. Attack requires valid user credentials but the exploitation process is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available, or implement workarounds and security controls.
🔧 Temporary Workarounds
Restrict PHP file uploads
allImplement server-side validation to block PHP file uploads in the chat photo upload functionality.
Modify upload validation logic to reject files with .php, .php5, .phtml extensions
Change upload directory permissions
linuxPrevent PHP execution in the /files/Messages/ directory by modifying web server configuration.
For Apache: Add 'php_flag engine off' to .htaccess in /files/Messages/ directory
For Nginx: Add 'location ~ \.php$ { deny all; }' to server block
🧯 If You Can't Patch
- Disable chat photo upload functionality completely
- Implement web application firewall (WAF) rules to block PHP file uploads
🔍 How to Verify
Check if Vulnerable:
Attempt to upload a PHP file through the chat photo upload feature. If successful and the file is accessible via web URL, the system is vulnerable.Check Version:
Check WebTareas version in admin panel or configuration files. Look for version 2.4 in the source code or documentation.Verify Fix Applied:
Attempt to upload a PHP file after implementing fixes. Verify the file is rejected or cannot be executed when accessed via URL.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /files/Messages/ directory
- PHP file uploads through chat functionality
- Multiple failed upload attempts followed by successful PHP upload
Network Indicators:
- HTTP POST requests to upload endpoints with PHP file content
- Subsequent requests to uploaded PHP files in /files/Messages/
SIEM Query:
source=web_logs (method=POST AND uri_path="/upload/chat_photo" AND file_extension="php") OR (uri_path CONTAINS "/files/Messages/" AND file_extension="php")