CVE-2024-58279
📋 TL;DR
appRain CMF 4.0.5 contains an authenticated remote code execution vulnerability that allows administrative users to upload malicious PHP files through the filemanager upload endpoint. Attackers with administrative credentials can upload crafted PHP files to create web shells and execute arbitrary commands on the server. This affects all installations of appRain CMF version 4.0.5 with administrative accounts.
💻 Affected Systems
- appRain CMF
📦 What is this software?
Apprain by Apprain
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise allowing attackers to execute arbitrary commands, steal data, install persistent backdoors, pivot to other systems, and potentially take complete control of the hosting environment.
Likely Case
Attackers create web shells to execute commands, deface websites, steal sensitive data, and establish persistence for further attacks.
If Mitigated
Limited impact if proper file upload validation, file type restrictions, and administrative access controls are implemented.
🎯 Exploit Status
Exploitation requires administrative credentials but is straightforward once authenticated. Public exploit code is available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch available. Check appRain website for security updates. Consider upgrading to newer versions if available.
🔧 Temporary Workarounds
Restrict File Upload Types
allConfigure web server or application to block PHP file uploads through the filemanager endpoint
# Apache: Add to .htaccess in uploads directory
<FilesMatch "\.php$">
Order Allow,Deny
Deny from all
</FilesMatch>
# Nginx: Add to server block
location ~* \.php$ {
deny all;
}
Implement File Upload Validation
allAdd server-side validation to restrict uploaded file types to non-executable formats only
# Example PHP validation snippet
$allowed_types = ['jpg', 'png', 'gif', 'pdf', 'txt'];
$file_extension = strtolower(pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION));
if (!in_array($file_extension, $allowed_types)) {
die('Invalid file type');
}
🧯 If You Can't Patch
- Immediately change all administrative passwords and implement multi-factor authentication
- Monitor uploads directory for suspicious PHP files and implement file integrity monitoring
🔍 How to Verify
Check if Vulnerable:
Check if running appRain CMF version 4.0.5 and test if PHP files can be uploaded through authenticated filemanager endpointCheck Version:
Check appRain configuration files or admin panel for version informationVerify Fix Applied:
Attempt to upload a PHP file through the filemanager endpoint after implementing workarounds - should be blocked📡 Detection & Monitoring
Log Indicators:
- PHP file uploads to uploads directory via filemanager endpoint
- Unusual administrative login patterns or locations
- POST requests to filemanager upload endpoint with PHP files
Network Indicators:
- HTTP POST requests to /filemanager/upload with PHP file content
- Subsequent requests to uploaded PHP files with command parameters
SIEM Query:
source="web_logs" AND (uri_path="/filemanager/upload" AND file_extension="php") OR (uri_path CONTAINS "/uploads/" AND file_extension="php")🔗 References
- https://github.com/apprain/apprain/archive/refs/tags/v4.0.5.zip
- https://www.apprain.org
- https://www.exploit-db.com/exploits/52041
- https://www.vulncheck.com/advisories/apprain-cmf-authenticated-remote-code-execution-via-filemanager-upload
- https://github.com/apprain/apprain/archive/refs/tags/v4.0.5.zip
