On Sun, 14 May 2006, Norbert Francois wrote:
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 ?
Obviously, the mentioned chroot(2), mknod(2) and mount(2) aren't programs,
but actual syscalls:
$ man 2 chroot
$ man 2 mknod
$ man 2 mount
Unless there are some mechanisms to enforce syscall execution limitation
(like systrace or similar) in place, you are able to execute any syscall
inside a chroot jail -- provided you have the required privileges, of
course.
Take also a look at the differences between regular chroot and FreeBSD's
jail, it might be of some interest to you:
http://en.wikipedia.org/wiki/Chroot_jail
http://en.wikipedia.org/wiki/FreeBSD_Jail
Hope this helps to clarify things a bit;)
Cheers,
--
Marco Ivaldi
Antifork Research, Inc. http://0xdeadbeef.info/
3B05 C9C5 A2DE C3D7 4233 0394 EF85 2008 DBFD B707
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