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

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Message-ID: <200311261418.58847.jeremiah@nur.net>
Date: Wed, 26 Nov 2003 14:18:56 -0800
From: Jeremiah Cornelius <jeremiah@....net>
To: Jakob Lell <jlell@...obLell.de>
Cc: Steven Leikeim <steven@...l.ucalgary.ca>, full-disclosure@...ts.netsys.com,
   bugtraq@...urityfocus.com
Subject: Re: Re: hard links on Linux create local DoS vulnerability and security problems


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On Monday 24 November 2003 10:17, Steven Leikeim wrote:
<SNIP>
> There is a simpler solution. Place user files on a separate filesystem
> from system files. This includes putting all temporary files on separate
> filesystems of their own. (Both /tmp and /var/tmp.) Since hard links
> cannot cross filesystems the problem disappears. Mounting user filesystems
> nosuid and nodev will prevent security problems should a setuid binary
> appear in that filesystem.

And a mandatory system profile in /etc , which aliases ln as 'ln -s' might 
help.  One for each valid shell.

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