From: Rob (capveg@cs.umd.edu)
Date: Fri May 12 2006 - 14:13:44 EDT
On Fri, May 12, 2006 at 12:37:43PM +0200, Norbert Franois wrote:
> Hi...
>
> 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 ?
from man 2 chroot():
-- Note that this call does not change the current working directory, so that '.' can be outside the tree rooted at '/'. In particular, the super-user can escape from a 'chroot jail' by doing 'mkdir foo; chroot foo; cd ..'. -- Also, mknod() some device files like /dev/kmem or /dev/hda1, then use root priviledges to muck with kernel, or raw write data to disk. - Rob . ------------------------------------------------------------------------------ This List Sponsored by: Cenzic Concerned about Web Application Security? Why not go with the #1 solution - Cenzic, the only one to win the Analyst's Choice Award from eWeek. As attacks through web applications continue to rise, you need to proactively protect your applications from hackers. Cenzic has the most comprehensive solutions to meet your application security penetration testing and vulnerability management needs. You have an option to go with a managed service (Cenzic ClickToSecure) or an enterprise software (Cenzic Hailstorm). Download FREE whitepaper on how a managed service can help you: http://www.cenzic.com/news_events/wpappsec.php And, now for a limited time we can do a FREE audit for you to confirm your results from other product. Contact us at request@cenzic.com for details. ------------------------------------------------------------------------------
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