kern/55568: DUMP has access to block devices in a JAIL
mjoyner at rv1.dynip.com
Wed Oct 8 20:40:09 PDT 2003
The following reply was made to PR kern/55568; it has been noted by GNATS.
From: mjoyner <mjoyner at rv1.dynip.com>
To: Kris Kennaway <kris at obsecurity.org>
Cc: FreeBSD-gnats-submit at FreeBSD.org
Subject: Re: kern/55568: DUMP has access to block devices in a JAIL
Date: Wed, 08 Oct 2003 23:33:50 -0400
Where would one find documentation to prevent the jailed user from being
able to dump the raw partition(s)?
Kris Kennaway wrote:
> On Wed, Aug 13, 2003 at 09:04:06PM -0400, mjoyner wrote:
>> A jailed root user can use DUMP and gain a snapshot of the
>> From there the jailed root user can restore files from the HOST
>> or any other jails at their leisure.
> Only if the administrator has configured the jail with the raw disk
> devices. As you note, this is a security risk.
>> Even if DEVFS is not mounted, a root user could possibly create a
>> device node anyways, and one needs TTYS anyways.
> I believe this to be untrue. root cannot make device nodes once
> inside a jail.
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