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Re: how an hacker can bypass a chrooted environement ?
From: "Norbert François" <norbertlike () gmail com>
Date: Sun, 14 May 2006 15:45:02 +0200

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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