Genexis Platinum-4410 2.1 - Authentication Bypass

# Exploit Title:  Genexis Platinum-4410 2.1 - Authentication Bypass
# Date: 20220-01-08
# Exploit Author: Husinul Sanub
# Author Contact: https://www.linkedin.com/in/husinul-sanub-658239106/
# Vulnerable Product: Genexis Platinum-4410 v2.1 Home Gateway Router https://genexis.co.in/product/ont/
# Firmware version: P4410-V2–1.28
# Vendor Homepage: https://genexis.co.in/
# Reference: https://medium.com/@husinulzsanub/exploiting-router-authentication-through-web-interface-68660c708206
# CVE: CVE-2020-6170

Vulnerability Details
======================
Genexis Platinum-4410 v2.1 Home Gateway Router discloses passwords of each users(Admin,GENEXIS,user3) in plain text behind login page source “http://192.168.1.1/cgi-bin/index2.asp". This could potentially allow a remote attacker access sensitive information and perform actions such as reset router, changing passwords, upload malicious firmware etc.

How to reproduce
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Suppose 192.168.1.1 is the router IP and check view page source of login page “http://192.168.1.1/cgi-bin/index2.asp",There we can found passwords for each login accounts in clear text.


POC
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* https://youtu.be/IO_Ez4XH-0Y