CVE-2023-50760
📋 TL;DR
Online Notice Board System v1.0 has an insecure file upload vulnerability that allows authenticated attackers to upload malicious files. This can lead to remote code execution on the server hosting the application. Organizations using this specific software version are affected.
💻 Affected Systems
- Online Notice Board System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise allowing attacker to execute arbitrary commands, steal data, install malware, or pivot to other systems.
Likely Case
Attacker gains shell access to the web server, potentially accessing sensitive data and modifying website content.
If Mitigated
File uploads are blocked or properly validated, preventing malicious file execution while maintaining legitimate functionality.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once authenticated
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.kashipara.com/
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Implement File Upload Validation
allAdd server-side validation to restrict uploaded files to specific extensions and verify file content
Modify user/update_profile_pic.php to validate file extensions and MIME types
Disable File Upload Feature
allTemporarily disable the profile picture upload functionality
Comment out or remove file upload code in update_profile_pic.php
🧯 If You Can't Patch
- Implement web application firewall rules to block malicious file uploads
- Restrict access to the update_profile_pic.php page to trusted users only
🔍 How to Verify
Check if Vulnerable:
Attempt to upload a PHP file via the profile picture upload feature and check if it executesCheck Version:
Check software version in admin panel or readme filesVerify Fix Applied:
Test that only allowed file types can be uploaded and uploaded files cannot be executed as code📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to update_profile_pic.php
- Uploads of non-image file types
- Multiple failed upload attempts
Network Indicators:
- POST requests to update_profile_pic.php with unusual file extensions
- Large file uploads to the profile update endpoint
SIEM Query:
source="web_server" AND uri="*/update_profile_pic.php" AND (file_extension="php" OR file_extension="exe" OR file_extension="sh")