CVE-2024-29514
📋 TL;DR
This vulnerability allows authenticated remote attackers to upload malicious PHP files to lepton v7.1.0, potentially leading to remote code execution. Any system running the vulnerable version of lepton with file upload functionality enabled is affected.
💻 Affected Systems
- lepton
📦 What is this software?
Leptoncms by Lepton Cms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the server, data exfiltration, and lateral movement within the network.
Likely Case
Webshell deployment allowing persistent access, data theft, and potential privilege escalation on the affected server.
If Mitigated
Limited impact with proper file upload restrictions, potentially only file storage without execution capability.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once credentials are obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check for updated version from lepton project. If unavailable, implement workarounds immediately.
🔧 Temporary Workarounds
Restrict PHP file uploads
allConfigure web server or application to block uploads of PHP files
# For Apache: Add to .htaccess
<FilesMatch "\.(php|php3|php4|php5|phtml|phar)$">
Deny from all
</FilesMatch>
# For Nginx: Add to server block
location ~ \.(php|php3|php4|php5|phtml|phar)$ {
deny all;
}
Implement file type validation
allAdd server-side validation to reject PHP file uploads
# Example PHP validation snippet
$allowed_extensions = array('jpg', 'png', 'gif', 'pdf', 'txt');
$file_extension = strtolower(pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION));
if (!in_array($file_extension, $allowed_extensions)) {
die('Invalid file type');
}
🧯 If You Can't Patch
- Disable file upload functionality completely in lepton configuration
- Implement WAF rules to block PHP file uploads at network perimeter
🔍 How to Verify
Check if Vulnerable:
Check lepton version in admin panel or configuration files. If version is 7.1.0 and file uploads are enabled, system is vulnerable.Check Version:
Check lepton configuration files or admin interface for version informationVerify Fix Applied:
Attempt to upload a PHP file after implementing fixes. Upload should be rejected or file should not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual file upload activity, especially PHP files
- Multiple failed upload attempts followed by successful PHP upload
- Web server logs showing execution of uploaded PHP files
Network Indicators:
- HTTP POST requests to upload endpoints with PHP file content
- Subsequent requests to uploaded PHP files
SIEM Query:
source="web_logs" AND (uri="*upload*" OR method="POST") AND (file_extension="php" OR content_type="application/x-php")