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RE: FDE and integrity of OS Was: How to Test HDD Encryption
From: "Craig Wright" <Craig.Wright () bdo com au>
Date: Thu, 15 Nov 2007 05:37:32 +1100

No programme - it is turned off.
 
With physical access you could install a customised BIOS chip reprogramed for this. The issue of cost is likely to 
affect this decision. What is needed to reflash the BIOS will vary with the brand of chip - but an EPROM writer and 
related software and a very good knowledge of the BIOS code will do it.
 
Regards,
Craig Wright (GSE-Compliance)



Craig Wright
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From: listbounce () securityfocus com on behalf of Mike Hale
Sent: Thu 15/11/2007 3:26 AM
To: Alexander Klimov
Cc: security-basics () securityfocus com
Subject: Re: FDE and integrity of OS Was: How to Test HDD Encryption



"attacker who has
temporary physical access to your computer (while it is switched off)
changes the system so that attacker's software loads first (the
attacker changes boot-sector or reflash BIOS)"

Do you have an example of a program that can do this?

On 11/14/07, Alexander Klimov <alserkli () inbox ru> wrote:
On Tue, 13 Nov 2007, Ansgar -59cobalt- Wiechers wrote:
But isn't FDE primarily targeted at protecting data from lost or
stolen systems? A bit over 40% of data breaches are due to lost or
stolen devices.

That's its primary use. However, FDE also protects the integrity of
the operating system while the computer is not running.

FDE can make tampering with your OS slightly harder but it does not
protect OS integrity in any strong sense. Consider the following
example (inspired by `Vbootkit' and `Blue Pill'): attacker who has
temporary physical access to your computer (while it is switched off)
changes the system so that attacker's software loads first (the
attacker changes boot-sector or reflash BIOS), this software loads the
rest of the system in a virtual environment. For the user the system
looks exactly the same as it was (e.g., the system asks for password
or a smart card and decrypts the OS), but in reality the attacker has
complete control.

--
Regards,
ASK



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