bugtraq - RE: hacking the mitsubishi GB-50A

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Date: Mon, 24 Mar 2008 11:06:44 -0400
From: "Desai, Ashish" <Ashish.Desai@....com>
To: "Chris Withers" <chris@...plistix.co.uk>,
	<bugtraq@...urityfocus.com>
Subject: RE: hacking the mitsubishi GB-50A

If you read your own post you would realize that Mitsubishi 
kept the device ipaddress prefix as 192.168.1 so only you can attack
yourself.

192.168 cannot be access from the internet ;-) [unless you NAT at which
point its your NAT config problem]

-----Original Message-----
From: Chris Withers [mailto:chris@...plistix.co.uk] 
Sent: Friday, March 21, 2008 9:50 PM
To: bugtraq@...urityfocus.com
Subject: hacking the mitsubishi GB-50A

Hi All,

Well, it's been over 4 months since my plea for a security contact at 
Mitsubishi Electric to come forward. Since no one has, I thought I'd 
release a POC for hacking one.

It's not exactly hard, the web controller uses a nasty set of Java 
applets to interact with itself. The shocking thing is that these 
communicate using a series of xml packets and absolutely zero 
authentication or encryption :-(

Oh, and just in case you thought about maybe putting something secure 
like an ssl webserver proxying the thing, these java applets are hard 
coded to connect back to port 80 on the originating host using HTTP :-(

Still, you should get an idea of how the box is *supposed* to be used by

the fact that its ip address is set with dip switches where the 
192.168.1 bit is hard coded!

*sigh*

Well, please find attached a little python script that will let you turn

on or off every aircon unit attached to a GB-50 that you know the ip 
address of. Minor modifications will let you change the set point and 
mode too, so you might be able to turn off a data centres aircon *or* 
turn an office's aircon up to 28'C and then turn it all on ;-)

The plus side is that because it's so rediculously insecure, it's not 
that hard to build a secure web app that can interact with it and then 
just firewall it off from anywhere harmful...

If you have a GB-50 or a GB-50A, please make very sure you keep it on 
its own private network until Mitsubishi Electric find a clue stick to 
hit themselves with!

cheers,

Chris

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Simplistix - Content Management, Zope & Python Consulting
            - http://www.simplistix.co.uk