full-disclosure - Re: AFS - The Ultimate Sulution?

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Message-ID: <242a0a8f0609201033p645b44aev465d4c7832a6e995@mail.gmail.com>
Date: Wed, 20 Sep 2006 13:33:48 -0400
From: "Brian Eaton" <eaton.lists@...il.com>
To: "Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: AFS - The Ultimate Sulution?

On 9/20/06, Valdis.Kletnieks@...edu <Valdis.Kletnieks@...edu> wrote:
> On Wed, 20 Sep 2006 17:41:04 +0300, Siim Pauder said:
> > Is it possible to update BIOS memory from outside of BIOS? If so, then
> > it would be possible to turn netboot off after compromising root.
>
> Sure.  It's called "reflashing the BIOS", and happens every time you upgrade
> the BIOS. (Smaller changes, like config changes, merely require poking stuff
> into the NVRAM).

For some reason I think one or more of the *BSD variants has support
for restricting the actions that root can take, which presumably
includes preventing root from modifying the BIOS.  I can't recall the
name of the feature, though, and I doubt you could teach Windows 2000
a similar trick.

Regards,
Brian

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