full-disclosure - MacOSX - crash screensaver locked with password and get the desktop back

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Message-ID: <1057328583.1655.170.camel@localhost.localdomain>
From: bipbip at xpto.org (Delfim Machado)
Subject: MacOSX - crash screensaver locked with password and get the
 desktop back

Hi all,

three days ago i discovered a security issue, with the last MacOSX. 

there is a way to crash the screensaver locked with password and gain
the desktop.

how? - you ask.
i don't know the exact amount of characters, only that if you leave a
key pressed for 5 minutes or more and then hit the enter key, you crash
the screensaver and gain access to the desktop.
you can mess the desktop and all around it (network, mail, docs,
anything you can imagine).

i think that this is a huge secure hole and it must be corrected.

i hope that this is good for everyone who cares about "how to secure
your desktop".

solution?
wait until someone at the apple make a patch and realise it...

here is the mail that i've sent to apple security people,  they didn't
replied :(

-- BEGIN APPLE MESSAGE --
                               To: 
product-security@...le.com
                          Subject: 
[BUG] forgot your screensaver
password ?? Hackit anyway
Hi all

(tested machines at the bottom of this message)

sorry about the subject, but there is a problem with the auth prompt
when you have the screensaver running.

i do not know the exact amount of characters to make the auth prompt
blow up, but here is what i do:

with the screensaver runnig, leave  something at the top of the keyboard
and leave it there for 5 or more minutes, then hit ENTER.
The screensaver dies and you have your desktop open to anyone.

desktop open, network open, hackers go away :)

i'll wait for an answer until 3 of Jully and then send this problem to
full-disclosure@...ts.netsys.com and bugtraq@...urityfocus.com

if you need more time, please tell me that i'll wait until the patch be
ready to deploy.

OS tested:  didn't get a mac not updated ... (uname -a)
(Powerbook)
Darwin roadrunner 6.6 Darwin Kernel Version 6.6: Thu May  1 21:48:54 PDT
2003; root:xnu/xnu-344.34.obj~1/RELEASE_PPC  Power Macintosh powerpc
(iMac)
Darwin MacLulo 6.6 Darwin Kernel Version 6.6: Thu May  1 21:48:54 PDT
2003; root:xnu/xnu-344.34.obj~1/RELEASE_PPC  Power Macintosh powerpc
(Powerbook)
Darwin Proenca-Powerbook17 6.6 Darwin Kernel Version 6.6: Thu May  1
21:48:54 PDT 2003; root:xnu/xnu-344.34.obj~1/RELEASE_PPC  Power
Macintosh powerpc

PS: MacOSX r0x, keep on the good way!

-- END APPLE MESSAGE --

Cheers
--
Delfim Machado - dbcm@...o.org
XPTO:: Portuguese OpenSource Community - http://lab.xpto.org
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