bugtraq - Re: aterm 0.4.2 tty permission weakness

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Date: Wed, 14 Jul 2004 00:10:05 -0400
From: Coleman Kane <cokane@...ane.org>
To: Maarten Tielemans <TTIelu_DaInfraCrew@...mail.com>
Cc: bugtraq@...urityfocus.com
Subject: Re: aterm 0.4.2 tty permission weakness


I'm using aterm 0.4.2 on my gentoo 2004.1 box. It looks like this:

cokane@...izophreniac:~> ls -l /dev/pts/16 
crw--w----  1 cokane tty 136, 16 Jul 14 00:09 /dev/pts/16

That is with mesg y. And I checked, it -is- pts/16.

On Tue, 2004-07-13 at 12:04, Maarten Tielemans wrote:
> Aterm has an issue with creating a terminal.
> 
> A quick ls al on a aterm with mesg y shows:
> crw--w--w-  1 alsdk  users    5,   3 Jul 13 17:27 /dev/ttyp3
> with mesg n:
> crw-----w-  1 alsdk  users    5,   3 Jul 13 17:28 /dev/ttyp3
> 
> 1) World (nobody) is able to echo or cat towards the terminal
> echo hello >> /dev/ttyp3
> cat mkdir >> /dev/ttyp3 
> 2) The group seems to be incorrect, a normal terminal has default group tty
> 
> A xterm with mesg y shows :
> crw--w----   1 ttielu  tty         5,   5 Jul 13 17:27 ttyp5
> and with mesg n :
> crw-------   1 ttielu  tty         5,   5 Jul 13 17:27 ttyp5
> 
> Advice: use xterm
> 
> Bug found by TTIelu, reverse engineered by alsdk and TTIelu