bugtraq - Re: Another Mac OS X ScreenSaver Security Issue (after Security Update 2003-07-14)

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Date: Thu, 31 Jul 2003 15:07:49 -0500
From: Brian Eckman <eckman@....edu>
To: Gavin Hanover <ghanover@...ntipress.com>,
	bugtraq@...urityfocus.com
Subject: Re: Another Mac OS X ScreenSaver Security Issue (after Security 
   Update 2003-07-14)


Gavin Hanover wrote:
> I don't quite agree. Windows uses control-alt-delete as a security
> device. It binds those keys as a hotkey in such a way that no other
> aplication can replace it. This is why it is used at logon; it
> prevents a user from creating a program that looked like a logon
> prompt, and could bind the control-alt-delete keys to display a
> password prompt. (pressing control-alt-delete in any application
> other than the logon screen would display the "shutdown/logoff/task
> manager" window, at which point you would know not to enter your
> password in any prompt)
> If someone were to find a way to bind to those hotkeys, would you
> then consider this a security issue with Windows? If so, how is
> Apple's failure to block kill calls to the screen saver not a
> security issue?
> 
> Gavin


Windows does allow others to bind to those hotkeys. The Novell client is 
a good example. The Novell NDS password can be used to unlock the screen 
saver, without requiring the Windows password to be entered. Obviously 
other programs could bypass the Windows authentication as well.

Brian
-- 
Brian Eckman
Security Analyst
OIT Security and Assurance
University of Minnesota
612-626-7737

"There are 10 types of people in this world. Those who
understand binary and those who don't."