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Date: Fri, 7 Dec 2012 20:01:45 +0000
From: Philip Whitehouse <philip@...uk.com>
To: "noloader@...il.com" <noloader@...il.com>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: Nokia phone forcing traffic through proxy

On 7 Dec 2012, at 19:03, Jeffrey Walton <noloader@...il.com> wrote:

> On Fri, Dec 7, 2012 at 11:55 AM, Gaurang Pandya <gaubrig@...oo.com> wrote:
>> It has been noticed that internet browsing traffic, instead of directly
>> hitting requested server, is being redirected to proxy servers. They get
>> redirected to Nokia/Ovi proxy servers if Nokia browser is used, and to Opera
>> proxy servers if Opera Mini browser is used.
>> 
>> More detailed info at :
>> http://gaurangkp.wordpress.com/2012/12/05/nokia-proxy/
> It sounds a lot like http://click-fraud-fun.blogspot.com/.
> 
> We know proxies can cause a lot of trouble in practice. For example,
> http://blog.cryptographyengineering.com/2012/03/how-do-interception-proxies-fail.html.
> 
> Proxies and data snatching are the reason to pin certificates when
> using VPN and SSL/TLS if a pre-existing relationship exists (for
> example, you know the host and its public key). Are you talking to an
> Nokia/Ovi proxy, an Interception proxy (perhaps enabled by Trustwave),
> or the host expected during a SSL/TLS negotiation?
> 
> We now have a much better body of knowledge. Its too bad most browser
> don't offer the features for those who are security conscious. On
> Android, Google went so far as to offer pinning as "opt-in" for sites:
> http://groups.google.com/group/android-security-discuss/browse_thread/thread/f5898be7ee9abc48.
> 
> Jeff

BlackBerry does this, Amazon Kindle Fire almost certainly does it, for caching purposes. I'm not sure whether that's why the Nokia phone is doing it though - you need a good infrastructure to support it.

Regards,

Philip Whitehouse
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