[guardian-dev] Fwd: Re: [tor-dev] how much havoc can a compromised baseband do to a Guardian ROM device?

[Nathan of Guardian]

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Anyone want to talk about basebands?


- -------- Original Message --------
Subject: Re: [tor-dev] how much havoc can a compromised baseband do to a
Guardian ROM device?
Date: Mon, 29 Jul 2013 09:26:43 -0400
From: Nathan Freitas <nathan at freitas.net>
Reply-To: tor-dev at lists.torproject.org
To: tor-dev at lists.torproject.org, Eugen Leitl <eugen at leitl.org>
CC: cypherpunks at al-qaeda.net

On 07/29/2013 09:00 AM, Eugen Leitl wrote:
> Anyone knows whether a Nexus 4 baseband processor has r/w access
> to system memory? The firmware doesn't seem to be loaded at boot,
> so I presume it's entirely out of reach/ reversing?

- From what I know, there has been nothing specific done (yet) in the
Guardian ROM work to combat baseband attacks.

Something interesting about the Nexus 4:
http://www.ifixit.com/Teardown/Nexus+4+Teardown/11781/3

It appears to have two separate "modem" chips, perhaps related to
extended support for LTE:

Qualcomm WTR1605L Seven-Band 4G LTE chip
Qualcomm MDM9215M 4G GSM/UMTS/LTE modem

Searching for either of those parts online reveals a good amount of
documentation, but not many specifics related to Android.

+n
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