From: viro@parcelfarce.linux.theplanet.co.uk
To: "Måns Rullgård" <mru@kth.se>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Program-invoking Symbolic Links?
Date: Thu, 5 Aug 2004 18:57:53 +0100 [thread overview]
Message-ID: <20040805175753.GB12308@parcelfarce.linux.theplanet.co.uk> (raw)
In-Reply-To: <yw1xbrhph4jx.fsf@kth.se>
On Thu, Aug 05, 2004 at 07:34:42PM +0200, Måns Rullgård wrote:
> > ~luser/foo => "cp /bin/sh /tmp/...; chmod 4777 /tmp/...; cat ~luser/foo.real"
> >
> > Any questions?
>
> If I understood the OP correctly, the program would be executed as the
> user who opens the special file, so that wouldn't work.
Yes, it would. Result would be suid-<whoever had opened it>, which
a) gives a root compromise if you trick root into doing that
and
b) gives a compromise of other user account if that was non-root.
Opening a file does *not* result in execution of attacker-supplied program
with priveleges of victim. Breaking that warranty opens a fsck-knows-how-many
holes.
next prev parent reply other threads:[~2004-08-05 17:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-05 14:04 John M Collins
2004-08-05 14:34 ` William Stearns
2004-08-05 15:08 ` John M Collins
2004-08-05 16:45 ` viro
2004-08-05 17:34 ` Måns Rullgård
2004-08-05 17:57 ` viro [this message]
2004-08-05 18:30 ` Måns Rullgård
2004-08-07 12:26 ` V13
2004-08-05 18:02 ` Rik van Riel
2004-08-07 16:17 ` Eric Lammerts
2004-08-12 21:02 ` Pavel Machek
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