From: Norbert François (norbertlike@gmail.com)
Date: Sun May 14 2006 - 09:45:02 EDT
Thank you very much for your replies.
But there's smth I still don't understand.
Few months ago I tried to install a jail chroot with "jail"
(http://www.jmcresearch.com/projects/jail/howto.html). In the chrooted
environement I didn't copy programs like "chroot" (itself), "mknod" or
"mount" known to be dangerous... So the only way to bypass this chroot
is to manually upload these tools ? If it is the case, the attacker
has to inject a code opening a socket on the victim's computer, isn't
it ?
Thanks
Norbert
On 5/13/06, Tonnerre Lombard <tonnerre.lombard@sygroup.ch> wrote:
> Salut,
>
> On Fri, 2006-05-12 at 11:37, Norbert Fran?ois wrote:
> > I was wondering how an attacker can bypass a chrooted environement. A
> > (common) technique consist in finding a vulnerable program (in the
> > chrooted environnement) and injecting it a shellcode (i.e
> > ../../../../../../../bin/bash for ex.) by BoF. But normally, in the
> > chrooted environement, you volontarily add only necessary tools (like
> > ls, cat, less...), and vulnerable softwares are uncommon...
> >
> > So... how do they this "exploit" of bypassing the chroot ?
>
> For example by getting a dir file descriptor from "outside" and
> fchrooting to that one.
>
> Tonnerre
> --
> SyGroup GmbH
> Tonnerre Lombard
>
> Loesungen mit System
> Tel:+41 61 333 80 33 Roeschenzerstrasse 9
> Fax:+41 61 383 14 67 4153 Reinach
> Web:www.sygroup.ch tonnerre.lombard@sygroup.ch
>
>
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