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Re: MITM and proxy messages [was: Call for Adoption: draft-song-dns-wireformat-http]

Martin Thomson <martin.thomson@gmail.com> Mon, 08 August 2016 03:39 UTC

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From: Martin Thomson <martin.thomson@gmail.com>
Date: Mon, 08 Aug 2016 13:34:52 +1000
Message-ID: <CABkgnnUsdWbWa2NDGfb-geu9g3aNvCoqfV=wTpsGdbAGwKcHnQ@mail.gmail.com>
To: Adrien de Croy <adrien@qbik.com>
Cc: Amos Jeffries <squid3@treenet.co.nz>, "ietf-http-wg@w3.org" <ietf-http-wg@w3.org>
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Subject: Re: MITM and proxy messages [was: Call for Adoption: draft-song-dns-wireformat-http]
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I'm familiar with the attack; I assumed that you were referring to it.
And yes, it's not great that we're leaking URLs.  I expect that to be
corrected (at least partially).

But I'm not sure what your point here is.

On 8 August 2016 at 12:49, Adrien de Croy <adrien@qbik.com> wrote:
>
> looks like there were a few presentations on it at black hat USA 2016.
>
> Fundamentally the PAC file comes down in the clear, from an unverified
> source.
>
> Can use the DNS lookup facility to effectively log any URL that is presented
> to the function, thereby leaking querystrings and URLs for https URIs.
>
> Proxy auto detect is enabled by default in pretty much all browsers at the
> moment it seems.
>
> Adrien
>
>
> ------ Original Message ------
> From: "Martin Thomson" <martin.thomson@gmail.com>
> To: "Adrien de Croy" <adrien@qbik.com>
> Cc: "Amos Jeffries" <squid3@treenet.co.nz>; "ietf-http-wg@w3.org"
> <ietf-http-wg@w3.org>
> Sent: 8/08/2016 2:17:26 PM
> Subject: Re: MITM and proxy messages [was: Call for Adoption:
> draft-song-dns-wireformat-http]
>
>> On 8 August 2016 at 12:05, Adrien de Croy <adrien@qbik.com> wrote:
>>>
>>>  It's kinda crazy that browsers, which are supposedly so
>>> security-conscious
>>>  are still happy to download and evaluate javascript from some source
>>> they
>>>  don't really verify (e.g. result of DNS lookup for WPAD or DHCP option
>>> 252).
>>
>>
>> I'm fairly sure that no browser wants to do that.  The alternative
>> must be worse though.
>>
>

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