CVE-2024-27480
📋 TL;DR
CVE-2024-27480 is an insecure file upload vulnerability in VvvebJs 1.7.2 that allows attackers to upload malicious files without proper validation. This can lead to remote code execution or server compromise. Any system running the vulnerable version of VvvebJs is affected.
💻 Affected Systems
- givanz VvvebJs
📦 What is this software?
Vvvebjs by Vvveb
⚠️ Risk & Real-World Impact
Worst Case
Complete server takeover through remote code execution, data theft, and lateral movement within the network.
Likely Case
Webshell deployment leading to persistent backdoor access, data exfiltration, and further exploitation.
If Mitigated
Limited impact with proper file validation and execution restrictions in place.
🎯 Exploit Status
Public proof-of-concept demonstrates file upload bypass techniques.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: Not available
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 for file uploads including file type checking, size limits, and content inspection.
Restrict Upload Directory Permissions
linuxSet upload directory permissions to prevent execution of uploaded files.
chmod 644 /path/to/upload/directory/*
chmod 755 /path/to/upload/directory/
🧯 If You Can't Patch
- Disable file upload functionality entirely if not required
- Implement web application firewall rules to block malicious file uploads
🔍 How to Verify
Check if Vulnerable:
Check if VvvebJs version is 1.7.2 or earlier and test file upload functionality with malicious files.Check Version:
Check package.json or version files in VvvebJs installation directoryVerify Fix Applied:
Test file upload with various file types to ensure proper validation is in place.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to upload directories
- Execution of files from upload directories
- Large number of file upload requests
Network Indicators:
- POST requests to file upload endpoints with suspicious file types
- Traffic to unexpected ports from web server
SIEM Query:
source="web_server" AND (url="*/upload*" OR method="POST") AND (file_extension="php" OR file_extension="jsp" OR file_extension="asp")