Re: Vista speach recognition

[Robert Graham <robert_david_graham () yahoo com>]

There are some easy defenses.

Echo-cancelation software is pretty straightforward. It would be
straightforward to remove anything coming out of the speakers from being picked
up by the microphone. Unfortunately, it would also be CPU intensive.

Unfortunately, more and more households have multiple computer, so while the
echo-cancelation computer wouldn't get hit, another computer in the room or
down the hall might.

The Logitech microphone on my desktop has a lighted-button that shows when the
microphone is on/off. That's one simple defense.


--- George Ou <george_ou () lanarchitect net> wrote:

> 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 () securosis com] 
> Sent: Tuesday, January 30, 2007 5:06 PM
> To: George Ou
> Cc: 'Dave Aitel'; dailydave () 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 () lists immunitysec com
> [mailto:dailydave-bounces () lists immunitysec com] On Behalf Of Dave Aitel
> Sent: Tuesday, January 30, 2007 12:48 PM
> To: dailydave () 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
> <http://www.nytimes.com/2007/01/30/technology/30bugs.html?pagewanted=1&_r=1>
> &_r=1 
>
> -dave
>
>
> On 1/30/07, Sebastian Krahmer <krahmer () suse de  <mailto:krahmer () 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 () suse de - SuSE Security Team 
> ~
>
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