bugtraq - Re: hard links on Linux create local DoS vulnerability and security problems

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Message-ID: <20031124202917.GM12047@tpetrasek.acs.internap.com>
Date: Mon, 24 Nov 2003 15:29:17 -0500
From: Trent Petrasek <tpetrasek@...ernap.com>
To: Carl Ekman <calle@...ig.nu>
Cc: Alan J Rosenthal <flaps@....toronto.edu>, bugtraq@...urityfocus.com,
   full-disclosure@...ts.netsys.com
Subject: Re: hard links on Linux create local DoS vulnerability and security problems


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Not sure what systems you may be referring to, but in my experience, /tmp is mounted as a device or mounted as swap, thus violating the 'cross-device' limitation of a hard link.

- --------------------------------------------------------
 Trenton Petrasek         
 tpetrasek@...ernap.com
- --------------------------------------------------------

On Mon, Nov 24, 2003 at 07:38:38PM +0100, Carl Ekman <calle@...ig.nu> wrote:
> Since many systems have /tmp on the root filesystem /tmp could also be used to 
> link to setuid binaries.
> 
> > The link to setuid programs is more of concern except that it won't be able
> > to happen unless you have setuid-root programs in a home directory
> > partition, which sounds bad anyway.
> 
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