full-disclosure - Re: screen 4.0.3 local Authentication Bypass

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Date: Mon, 4 Jun 2007 19:00:38 +0200
From: "Lolek of TK53" <lolek1337@...glemail.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: screen 4.0.3 local Authentication Bypass

Hi,
On 6/4/07, rembrandt@...erlin.de <rembrandt@...erlin.de> wrote:
> Please take a look at the Attachement dear List moderator. :)
...
> It has been tested on OpenBSD 4.1 + screen 4.0.3 on x86.
>
> How to reproduce:
>
> Lock screen using ctrl+x
> Choose a Password
> Confirm the Password
>
> Screen asks for a Password to unlock the screen.
> Just press ctrl+c and it displays "Getpass error".
> 2 seconds later the screen is unlocked and you`ve access.

This is not reproducable with screen 4.0.3 on a Linux system. Also
with looking at the code of screen I can see no vulnerability in this
context. Can you show some code that proves your claim?
If not I suggest to get a better operating system distributor ;)
Cheers
Lolek of TK53
P.S. It's ctrl-a x not ctrl-x

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