full-disclosure - Re: JavaScript exploits via source code disclosure

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Date: Thu, 06 May 2010 13:59:44 -0400
From: "Elazar Broad" <elazar@...hmail.com>
To: tbiehn@...il.com
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: JavaScript exploits via source code disclosure

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If his users are authenticated via say regular form login, he can
pass some sort of hash which identifies the user and session to the
service, with the authentication wrapper being server side, which
begs the question, do you trust your users...

How would such a firewall work/help anyway? It still has to make
some sort of authorization decision, and if the services in
question are not called by pages that are login protected, your
back to square one. How do you pass some sort of 'I know this is
the page calling me and not the attacker' without the client seeing
that too?

elazar

On Thu, 06 May 2010 13:46:08 -0400 T Biehn <tbiehn@...il.com> wrote:
>A proxy or 'web-service firewall' prior to the 'protected' web
>service is
>the correct answer.
>
>Obfuscating the client code be it JavaScript, Interpreted (Java,
>CLR, etc)
>or Native ignores the notion that the client controls hardware,
>OS, the
>executing process and the network.
>
>Signals can be intercepted at any layer.
>
>Any other assertion is ridiculous and a waste of time and effort.
>
>-Travis
>
>On Thu, May 6, 2010 at 1:08 PM, Elazar Broad <elazar@...hmail.com>
>wrote:
>
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>>
>> Unless you wrap your service methods with some form of an
>> authentication, your webservice's are just as public as any
>other
>> "world" accessible part of your site. Are the pages calling
>these
>> services behind any sort of authentication?
>>
>> On Thu, 06 May 2010 01:44:07 -0400 Ed Carp <erc@...ox.com>
>wrote:
>> >We've got a lot of JQuery code that calls back-end web
>services,
>> >and
>> >we're worried about exposing the web services to the outside
>world
>> >-
>> >anyone can "view source" and see exactly how we're calling our
>web
>> >services.
>> >
>> >Are there any suggestions or guidelines regarding protecting
>one's
>> >source from such disclosure?  Thanks in advance!
>> >
>> >_______________________________________________
>> >Full-Disclosure - We believe in it.
>> >Charter: http://lists.grok.org.uk/full-disclosure-charter.html
>> >Hosted and sponsored by Secunia - http://secunia.com/
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>> _______________________________________________
>> Full-Disclosure - We believe in it.
>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
>> Hosted and sponsored by Secunia - http://secunia.com/
>>
>
>
>
>--
>FD1D E574 6CAB 2FAF 2921  F22E B8B7 9D0D 99FF A73C
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>http://pastebin.com/f6fd606da
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/