Date: Fri, 7 Oct 2011 19:18:15 -0300
From: Marshall Whittaker <marshallwhittaker@...il.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Verizon Wireless DNS Tunneling

I suppose now that I think about it, it would also be possible to write a
program for your cell phone to do this (to get access from the phone alone,
without a computer tethered).  I don't know enough about cell phone
programming to do it myself though.

On Fri, Oct 7, 2011 at 4:51 PM, Dan Kaminsky <dan@...para.com> wrote:

> You never know what you'll be breaking, but you always know you'll be
> paying for support calls.
>
>
> On Fri, Oct 7, 2011 at 12:38 PM, Hartley, Christopher <hartley.87@....edu>wrote:
>
>> I would think that at minimum, thresholds could be set on how many names
>> to resolve, and permitted types for unauthenticated users.  Prohibit NULL
>> and TXT records for unauthenticated hosts - or just whitelist A and CNAMEs,
>> reject others.  Reject the 50th (or whatever) query from an unauthenticated
>> host/user... I don't think NACs are using DNS tricks in the main anymore
>> anyway.  They shouldn't be...  there are much better ways.
>>
>> That said, I'm happy for this condition to exist permanently so long as
>> I'm not responsible for the traffic.
>>
>>
>> On Oct 7, 2011, at 10:26 AM, James Wright wrote:
>>
>> Actually, yes, they could provide bad data.  I believe (perhaps
>> erroneously) that Comcast does this.  Probably other service providers do
>> too.  Until you are authenticated to use their network you are redirected to
>> a service page that can help authenticate you.  If you have connectivity
>> issues (like bad cached DNS entries) after authenticating you are to reboot
>> (or otherwise clear the local DNS cache).
>>
>> I don't really see why Verizon could not do similar.  All DNS traffic from
>> an unauthenticated user/machine would be redirected to a DNS server that
>> only returned the appropriate service page.  Most or all other traffic would
>> be blocked.  Much like NAC.
>>
>>
>> Thanks,
>> James
>>
>>
>> On Fri, Oct 7, 2011 at 10:05 AM, Dan Kaminsky <dan@...para.com> wrote:
>>
>>> One major reason it sticks around is -- what are you supposed to do,
>>> return bad data until the user is properly logged in?  It might get cached
>>> -- and while operating systems respect TTL, browsers most assuredly do not
>>> ("well, it MIGHT take us somewhere good").
>>>
>>> It's not like there's a magic off switch that makes this go away.
>>>
>>> On Fri, Oct 7, 2011 at 4:56 AM, Marshall Whittaker <
>>> marshallwhittaker@...il.com> wrote:
>>>
>>>> Yes, I've found that DNS tunneling works well at the college I go to on
>>>> their WIFI.  I've never gotten ICMP tunneling to work myself (outside of a
>>>> virtual machine),  but I have some code laying around somewhere that can do
>>>> it just in case I need it for something sometime.  Just thought it would be
>>>> interesting to some people that it works on such a large provider as
>>>> Verizon.  The only problem with it that I see is that it's quite slow.  But
>>>> if it works, so be it.  Good for checking email and browsing the web and
>>>> such on the road.  But I wouldn't try to torrent a linux distro with it,
>>>> haha.
>>>>
>>>> --oxagast
>>>>
>>>> On Fri, Oct 7, 2011 at 7:39 AM, BH <lists@...ckhat.bz> wrote:
>>>>
>>>>>  This comes in handy when travelling, I also found a few places where
>>>>> ICMP tunnelling works well.
>>>>>
>>>>>
>>>>> On 7/10/2011 6:35 PM, Dan Kaminsky wrote:
>>>>>
>>>>> Works mostly everywhere.  It's apparently enough of a pain in the butt
>>>>> to deal with, and abused so infrequently, that it's left alone.
>>>>>
>>>>> On Fri, Oct 7, 2011 at 3:32 AM, Marshall Whittaker <
>>>>> marshallwhittaker@...il.com> wrote:
>>>>>
>>>>>> I recently noticed that you can tunnel TCP through DNS (I used iodine)
>>>>>> to penetrate Verizon Wireless' firewall.  You can connect, and if you can
>>>>>> hold the connection long enough to make a DNS tunnel, then the connection
>>>>>> stays up, then use SSH -D to create a proxy server for your traffic. Bottom
>>>>>> line is, you can use the internet without paying. I made a video of it.  It
>>>>>> can be seen here:
>>>>>> http://www.youtube.com/user/Oxagast?blend=2&ob=5#p/u/0/X6oWESQMVd8 I
>>>>>> tried to contact Verizon on their security blog about it a few weeks ago at
>>>>>> http://securityblog.verizonbusiness.com/ however, I have not had a
>>>>>> response.  This technique still works as of this posting.  Maybe this will
>>>>>> help them get their act together ;-)
>>>>>>
>>>>>>  --oxagast
>>>>>>
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>>>>>
>>>>>
>>>>>
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>>>>> _______________________________________________
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>>>>
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>
> _______________________________________________
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