Dailydave mailing list archives
Re: Vista speach recognition
From: "Clemens, Dan" <Dan.Clemens () healthsouth com>
Date: Wed, 31 Jan 2007 08:00:19 -0600
I can see it now. www.nad.org is defaced by someone saying 'echo commands' . "Ev1l script k1d13s have 0wn3d all your bas3, hear our roar!" La Times reports NAD.org administers say "we never heard it comin... And then we got hit".... -Daniel -----Original Message----- From: dailydave-bounces () lists immunitysec com [mailto:dailydave-bounces () lists immunitysec com] On Behalf Of George Ou Sent: Wednesday, January 31, 2007 2:22 AM To: 'Robert Graham'; 'Rich Mogull' Cc: dailydave () lists immunitysec com Subject: Re: [Dailydave] Vista speach recognition I don't see how it should be so computationally expensive. Polycom does their echo cancellation in software for their communicator product and it doesn't cost a whole lot of CPU even on a low-end machine. Microsoft Windows Messenger does superb echo cancellation (much better than Skype though they need to get a clue on firewall friendliness) when you're using speakers and even a cheap desktop standing microphone and it didn't cost a lot of CPU in the one gigahertz era. There's just no reason that what comes out of a computer should be processed back in by a speech recognition system EVEN if they implemented some sort of password you have to speak. But they haven't even implemented a password and you can just playback "start listening" to wake the speech command engine. The multiple computer scenario would be a little more difficult to defend against though it's a lot less likely. Heck it could be a TV show that barks out a kill-all-documents sequence. I guess one way to defeat that is to use the new multi-Mic technology in Vista to pin point a voice in space and require the voice to be coming from there. I've already successfully tested a full scenario where I recorded and played back a file that: 1. Woke the speech command engine. 2. Open Windows Explorer. 3. Highlight documents. 4. Delete documents and confirm yes. 5. Go to recycle bin on desktop. 6. Tell it to empty the trash and confirm yes. All this without triggering UAC or requiring user interaction. If you want a shorter sequence of commands as a gag; just say "start", "shutdown". The only thing I didn't do is put that sound file on a website with auto-playback turned on and I know that technically trivial. George -----Original Message----- From: Robert Graham [mailto:robert_david_graham () yahoo com] Sent: Tuesday, January 30, 2007 9:34 PM To: George Ou; 'Rich Mogull' Cc: dailydave () lists immunitysec com Subject: Re: [Dailydave] Vista speach recognition 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 ~ _______________________________________________ Dailydave mailing list Dailydave () lists immunitysec com http://lists.immunitysec.com/mailman/listinfo/dailydave _______________________________________________ Dailydave mailing list Dailydave () lists immunitysec com http://lists.immunitysec.com/mailman/listinfo/dailydave_______________________________________________Dailydave mailing list Dailydave () lists immunitysec com http://lists.immunitysec.com/mailman/listinfo/dailydave
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Current thread:
- Vista speach recognition Sebastian Krahmer (Jan 30)
- Re: Vista speach recognition Dave Aitel (Jan 30)
- Re: Vista speach recognition George Ou (Jan 30)
- Re: Vista speach recognition Rich Mogull (Jan 30)
- Re: Vista speach recognition George Ou (Jan 30)
- Re: Vista speach recognition Robert Graham (Jan 31)
- Re: Vista speach recognition George Ou (Jan 31)
- Re: Vista speach recognition Clemens, Dan (Jan 31)
- Re: Vista speach recognition dan (Jan 31)
- Not the dead "Vista speach recognition" thread (: I)ruid (Feb 06)
- Re: Vista speach recognition Dafydd Stuttard (Jan 31)
- Re: Vista speach recognition George Ou (Jan 30)
- Re: Vista speach recognition jf (Jan 31)
- Re: Vista speach recognition Dave Aitel (Jan 30)
- Re: Vista speach recognition Thierry Zoller (Jan 31)
- Re: [RGSPAM] Re: Vista speach recognition Martin Roesch (Jan 31)
- Re: [RGSPAM] Re: Vista speach recognition christian void (Jan 31)
- Re: Vista speach recognition Sebastian Krahmer (Jan 31)
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- Re: Vista speach recognition George Ou (Jan 31)
- Re: Vista speach recognition dan (Jan 31)