Re: About system clocks...

From: Jim March <jmarch_at_prodigy_dot_net>
Date: Wed May 04 2005 - 17:33:31 CDT

Ron Crane wrote:

> On May 4, 2005, at 2:56 PM, Jim March wrote:
>
>> Are there any common PC BIOSes that allow blocking of date/time
>> changes? This has an effect on the accuracy of the audit log. If
>> I'm a hacker and want to "add votes" later, changing when the votes
>> appear to have been added by rebooting and getting into BIOS setup to
>> change the time is an old trick...
>
>
> I don't know, but many BIOSes provide passwords. If the key management
> I've seen elsewhere is any indication, the passwords probably are
> stored as plaintext in a flash RAM, but, since recovering them (or
> replacing the flash RAM) requires physical access to the machine, they
> potentially provide some security. Of course, they may also have
> backdoors, or even provide an official way to reset the password to a
> known value.
>
> -R

Yeah, I know about BIOS passwords. I'm looking for something more
stringent.

You know how to defeat the BIOS password? Find the CMOS memory chip on
the motherboard, typically near the battery. Take any straight piece of
metal, a paperclip will do, and lay it across the CMOS memory chip pins
one row at a time (typically square hence four rows). This "blows the
contents" of CMOS memory. You lose all the BIOS settings and have to
re-enter them and reset the date/time - but you also blow out the password.

Haven't had to do that in a number of years...six or seven? Anyways,
have things gotten better either standard or by special order?

Jim
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Received on Tue May 31 23:17:18 2005

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