kern/55568: DUMP has access to block devices in a JAIL

[Kris Kennaway]

The following reply was made to PR kern/55568; it has been noted by GNATS.

From: Kris Kennaway <kris at obsecurity.org>
To: mjoyner <mjoyner at rv1.dynip.com>
Cc: FreeBSD-gnats-submit at FreeBSD.org
Subject: Re: kern/55568: DUMP has access to block devices in a JAIL
Date: Wed, 8 Oct 2003 15:23:02 -0700

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 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
 > entire disk.
 >          From there the jailed root user can restore files from the HOST
 > SYSTEM
 >          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.
 
 Kris
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