Re: HEADS UP: Re: FreeBSD Security Advisory FreeBSD-SA-07:01.jail

Hi Colin,

On Thu, Jan 11, 2007 at 04:51:02PM -0800, Colin Percival wrote:
Hello Everyone,

I usually let security advisories speak for themselves, but I want to call
special attention to this one: If you use jails, READ THE ADVISORY, in
particular the "NOTE WELL" part below; and if you have problems after applying
the security patch, LET US KNOW -- we do everything we can to make sure
that security updates will never cause problems, but in this case we could
not fix the all of the security issues without either making assumptions
about how systems are configured or reducing functionality.

In the end we opted to reduce functionality (the jail startup process is
no longer logged to /var/log/console.log inside the jail), make an assumption
about how systems are configured (filesystems which are mounted via per-jail
fstab files should not be mounted on symlinks -- if you do this, adjust your
fstab files to give the real, non-symlinked, path to the mount point), and
leave a potential security problem unfixed (if you mount any filesystems via
per-jail fstab files on mount points which are visible within multiple jails,
there are problems -- don't do this).

While this is not ideal, this security issue was extraordinarily messy due to
the power and flexibility of the jails and the jail rc.d script. I can't
recall any other time when the security team has spent this long trying to
find a working patch for a security issue. I'd like to publicly thank Simon
Nielsen for the many many hours he spent working on this issue, as well as
the release engineering team for being very patient with us and delaying the
upcoming release to give us time to fix this.

Thank you very much to Simon Nielsen for the work being accomplished.
According to the patch itself, it is clear he should have spent much
time to resolve this issue.

However both Pawel and Dirk seem to have proposed less limitating
solutions. I understand we are talking about security and we may not
have much time experimenting every solutions on RELENG_6. Nonetheless
CURRENT the one place to experiment such solutions with a larger
audience and I would be very pleased to see a less restrictive
workaround for this problem. Indeed I'm using the same setup as Pawel
(/jail -> /usr/jail).

Thank you for your work as a security officer.
Best regards,
Jeremie Le Hen
< jeremie at le-hen dot org >< ttz at chchile dot org >
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