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Re: [hybi] Handshake was: The WebSocket protocol issues.

Scott Ferguson <ferg@caucho.com> Wed, 06 October 2010 01:29 UTC

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Date: Tue, 05 Oct 2010 18:30:07 -0700
From: Scott Ferguson <ferg@caucho.com>
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To: Adam Barth <ietf@adambarth.com>
References: <AANLkTikszM0pVE-0dpZ2kv=i=y5yzS2ekeyZxtz9N=fQ@mail.gmail.com> <4FAC5C93-9BDF-4752-AFBC-162D718397AB@apple.com> <AANLkTikcH1W3bQwumqHbe-Yqa3XdoJqCa2b-mZuvoQ7g@mail.gmail.com> <9746E847-DC8B-45A7-ADF3-2ADB9DA7F82E@apple.com> <AANLkTik9igUwoxVrktoBoZrPoUW=Tjh7HyVbGJgQYes-@mail.gmail.com> <9F595226-FA0A-4C38-A6D0-0F4214BD7D21@apple.com> <4CA4BE10.1010709@caucho.com> <AANLkTi=wKFnNOuM+U3fktAFRn3R5OZ7c6PR2W3EAy7tm@mail.gmail.com> <4CA53E6B.1040808@caucho.com> <AANLkTikOyvF5AHTf4sDD=rWmK2FTD6R6LaHa4KTqkbcm@mail.gmail.com> <4CA68098.8010404@caucho.com> <AANLkTinYhW9MnnM3tkbCWziePyM7mFUEteKhw5OGp-eS@mail.gmail.com> <AANLkTi=_ejOCNiM49VW5q05=H7-M0jzAvXvGaKM1b7mX@mail.gmail.com> <AANLkTimyJj+Jxz1Q6fLrQ8iosGkD+0shUh3=td+jX_Do@mail.gmail.com> <4CA772A1.2090808@caucho.com> <AANLkTi=nLixtxMEd4B58Zp5FRbquNX2C_=7gCf9BGGQs@mail.gmail.com> <4CABCBFA.6020100@caucho.com> <AANLkTi=5wbCXWpOtUQT1MndgCxt9gj6uR_3U=nONpjKc@mail.gmail.com>
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Cc: hybi <hybi@ietf.org>
Subject: Re: [hybi] Handshake was: The WebSocket protocol issues.
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Adam Barth wrote:
> On Tue, Oct 5, 2010 at 6:08 PM, Scott Ferguson <ferg@caucho.com> wrote:
>   
>> Adam Barth wrote:
>>     
>>>
>> If you assume the hijacker has control of a DNS server to act as a proxy,
>> you may as well assume he has control of an actual WebSocket server to act
>> as a proxy.
>>     
>
> Huh?  That doesn't make any sense.  If you run a stock DNS server, it
> will proxy lots of information from authoritative DNS servers around
> the world.  That's the whole point of DNS.
>   

C1: Browser at 192.168.1.10 makes TCP websocket connection with local 
port 8888 to DNS server 10.0.0.1.

S2: DNS server returns DNS response to 192.168.1.10:8888 which contains 
H(c-nonce, "WebSocket") somewhere in the payload

C3: Browser notices that DNS reponse does not have the same syntax as a 
WebSocket  response, and closes the connection.

How is this an attack?

-- Scott



> Adam
>
>
>
>

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