Recently I bought a MTS MBlaze 3G Plus Wi-Fi USB Modem. I picked it because, it got pretty good tariff plans & speed compared to other providers in my area. The interesting thing is that, it allowed up to 5 devices to connect to it via Wi-Fi. So it appears to me as a fast, cheap and portable broadband alternative. This device is manufactured by ZTE, a Chinese multinational telecommunications equipment and systems company.
MBlaze has two way of operation :-
Connect to Computer and use it like any other USB Net setter.
Connect to a 5V charger and it will start a Wi-Fi network with connectivity up to 5 devices.
As I am a Security Guy, I checked the Router web interface of the device and was surprised to see hell lot of vulnerabilities in a new Device.
One thing I noticed is that Wi-Fi WPA/WPA2/WEP Key is shown as plain text in the text box.
MTS MBlaze Wi-Fi Password
After some digging outs, it was found that the passwords are hard coded in the source code.
The router web interface password is hard coded in the password reset page.
MTS MBlaze Router Credentials
The worst thing was that the session maintaining cookie used by the router web interface is static. This Cookie (iusername=logined) is all you need to get an authenticated session.
As this session cookie is constant all the times, simply setting the cookie will give access to protected pages in the web interface.
Another issue I found was, that you can reset the router web interface password without knowing old password. You dont even need the session cookie for password resetting.
The following request is a PoC to reset the password without knowing the old password and with an unauthenticated session.
This will be considered under OWASP Top 10- A4, Insecure Direct Object Reference.
Now the Wi-Fi Key is changed to xboz. From this point, the attacker can connect to the Wi-Fi network and execute the exploit to gain access to the MTS device.
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