CVE-2025-6900
📋 TL;DR
This critical vulnerability in code-projects Library System 1.0 allows remote attackers to upload arbitrary files via the /add-book.php endpoint's image parameter. This can lead to remote code execution, data theft, or complete system compromise. All installations of Library System 1.0 with the vulnerable file accessible are affected.
💻 Affected Systems
- code-projects Library System
📦 What is this software?
Library System by Code Projects
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system takeover, data exfiltration, ransomware deployment, or creation of persistent backdoors.
Likely Case
Webshell upload enabling unauthorized access, file manipulation, and potential lateral movement within the network.
If Mitigated
File upload attempts blocked or quarantined with no successful exploitation.
🎯 Exploit Status
Exploit details are publicly available on GitHub. Simple file upload manipulation required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://code-projects.org/
Restart Required: No
Instructions:
No official patch available. Check vendor website for updates. Consider implementing workarounds or replacing software.
🔧 Temporary Workarounds
Restrict File Uploads
allImplement strict file upload validation including file type checking, size limits, and content verification
Disable /add-book.php
linuxTemporarily disable or restrict access to the vulnerable endpoint
# Apache: RewriteRule ^/add-book\.php$ - [F,L]
# Nginx: location ~ /add-book\.php$ { deny all; }
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block malicious file uploads
- Isolate the system in a restricted network segment with strict outbound filtering
🔍 How to Verify
Check if Vulnerable:
Check if /add-book.php exists and accepts file uploads without proper validation. Test with controlled file upload attempts.Check Version:
Check application files or documentation for version information. No standard command available.Verify Fix Applied:
Attempt to upload malicious files (e.g., .php, .exe) to /add-book.php and verify they are rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /add-book.php
- Large number of upload attempts
- Uploads of executable file types
Network Indicators:
- POST requests to /add-book.php with file uploads
- Unusual outbound connections from web server
SIEM Query:
source="web_logs" AND uri="/add-book.php" AND method="POST" AND (file_extension="php" OR file_extension="exe" OR file_extension="sh")