[Dailydave] Vista speach recognition

[Ross Brown]

It would seem to me that you could use this to do some things that overcome other security features, like using the speech flaw to open an Instant Message or Skype session to create an outbound connection to a remote user, defeating some firewall protections.

Why they didn't just go ahead and figure "doh, these OS/X guys prolly did this for a reason is beyond me.

RB

-----Original Message-----
From: dailydave-bounces at lists.immunitysec.com
To: 'Rich Mogull'
CC: dailydave at lists.immunitysec.com
Sent: Tue Jan 30 17:09:51 2007
Subject: Re: [Dailydave] Vista speach recognition

It won't bypass UAC and it won't let you have the command prompt control.  You can open the command prompt but it won't actually run commands.  However, you can wake an idle speech system, interact with the desktop, delete user files, and do all this without user interaction or ever triggering UAC or Secure Desktop.  That sounds like a serious remote exploit to me.  There are mitigating factors of course, but it's still pretty serious.  I figured this was too obvious to be an exploit, but I figured wrong.
 
 
George

________________________________

From: Rich Mogull [mailto:rmogull-dd at securosis.com] 
Sent: Tuesday, January 30, 2007 5:06 PM
To: George Ou
Cc: 'Dave Aitel'; dailydave at lists.immunitysec.com
Subject: Re: [Dailydave] Vista speach recognition


I just tested this on Vista and it works. 

Running Vista Ultimate in Parallels on my Mac I enabled voice commands, then recorded a simple command and played it back. Using the mic and speakers on my Mac the commands executed. Sound quality was actually terrible because of poor Vista performance in the VM.

But UAC seems to stop it. At the suggestion of Dave Maynor I tried to create a new user account. The usual UAC window popped up and no voice commands seemed to work.

I suspect anything that avoids the "final" (greyed out background) UAC dialogs will work, but looks like UAC stops it. At least in my quick test...

-rich


On Jan 30, 2007, at 2:27 PM, George Ou wrote:


	Voice command is autoloaded if you calibrate the system and enable Voice commands. You can actually activate voice command mode by saying a certain phrase. If this exploit works, you could say that phrase first and then start your commands. Then you'd say "start", "cmd", "enter", then bark out the commands you want. This assumes it works and that no one near the PC gets suspicious :).
			George

________________________________

	From: dailydave-bounces at lists.immunitysec.com [mailto:dailydave-bounces at lists.immunitysec.com] On Behalf Of Dave Aitel
	Sent: Tuesday, January 30, 2007 12:48 PM
	To: dailydave at lists.immunitysec.com
	Subject: Re: [Dailydave] Vista speach recognition
	
	
	That's a great idea! If the Microsoft people have thought of it, no doubt they ignore any sound coming out of the speakers, so you'll have to rely on an echo effect. Essentially you can always win if your model of the acoustic properties of the room is better than Vistas. :> Many speech recognition systems I've seen require the user to press a button first, of course. :> I haven't tested Vista's. I have, however, gotten CANVAS working on Vista. ( http://www.immunityinc.com/images/CANVAS_on_Vista.png). So far I recommend it over Windows XP SP2 because I think they removed that broken limitation from the TCP stack where you could only make 5 connections at once. 
	
	Also, here is an article about Evgeny! ok. Not entirely about Evgeny. Mostly about people buying bugs. For someone who's wife is a lawyer in this field, there's a lot of "apparently legal" talk in it. It's just plain legal! Everybody deal. 
	http://www.nytimes.com/2007/01/30/technology/30bugs.html?pagewanted=1&_r=1 <http://www.nytimes.com/2007/01/30/technology/30bugs.html?pagewanted=1&_r=1> 
	
	-dave
	
	
	On 1/30/07, Sebastian Krahmer <krahmer at suse.de > wrote: 


		Hi,
		
		I am in no way an Win expert but recently I read that
		vista will support commands as they are spoken by the user.
		What about websites where the browser is playing wav or similar
		audio files upon visiting? what if they contain spoken
		commands? An exploit audio file which speaks something like 
		'open shell' would be cool, eh?
		
		Sebastian
		
		
		--
		~
		~ perl self.pl
		~ $_='print"\$_=\47$_\47;eval"';eval
		~ krahmer at suse.de - SuSE Security Team 
		~
		
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