From: "Måns Rullgård" <mru@kth.se>
To: viro@parcelfarce.linux.theplanet.co.uk
Cc: linux-kernel@vger.kernel.org
Subject: Re: Program-invoking Symbolic Links?
Date: Thu, 05 Aug 2004 20:30:09 +0200 [thread overview]
Message-ID: <yw1x3c31h1zi.fsf@kth.se> (raw)
In-Reply-To: <20040805175753.GB12308@parcelfarce.linux.theplanet.co.uk> (viro@parcelfarce.linux.theplanet.co.uk's message of "Thu, 5 Aug 2004 18:57:53 +0100")
viro@parcelfarce.linux.theplanet.co.uk writes:
> 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.
Of course you're right.
> 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.
Just look at msoutlook.
--
Måns Rullgård
mru@kth.se
next prev parent reply other threads:[~2004-08-05 18:37 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-05 14:04 Program-invoking Symbolic Links? 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
2004-08-05 18:30 ` Måns Rullgård [this message]
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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