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SubjectRe: Program-invoking Symbolic Links?
From
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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
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