Re: [WEB SECURITY] HTTP Parameter Pollution

[Stefano Di Paola <stefano.dipaola () wisec it>]

Hi Mostafa,
yes, we have thought about the info leakage as well. It is definitively
a "side-effect" of this kind of attack. However, we had to stress the
concepts of HPP (because of limited time during the talk) and hope for
the community members like you to add useful informations and research
about HPP.

If you have additional stuff, we may consider to include it in our
whitepaper.

Cheers,
Stefano & Luca

Il giorno mar, 19/05/2009 alle 19.59 +0300, Mostafa Siraj ha scritto:
> Hello Stefano,
>
>
> This is a very interesting paper, I tested several websites and found
> some of them behaving unusual, I guess you need to add more
> harmful  attack vector to get more recognition for your white paper.
>
>
> I'm sharing here with another attack vector at a very popular Arabic
> search engine called Onkosh (check the image below)
>
>
> I guess another useful use from this attack is information leakage
> about the web server, since -as listed in your presentation- different
> web servers react differently to this attack, we can use that to know
> which web server we're dealing with and possibly form another attack
> depending on that.
>
>
> anyway this is really a great work
>
>
>
> HPP_example.png
>
>
> Thanks
>
>
> Mostafa Siraj
> Application Security Expert
> ITWorx Egypt
> www.ITWorx.com
>
>
>
>
>
>
> On Tue, May 19, 2009 at 2:52 PM, Stefano Di Paola
> <stefano.dipaola () wisec it> wrote:
>         Hi guys,
>         
>         during OWASP AppSec Poland 2009 we presented a newly
>         discovered input
>         validation vulnerability called "HTTP Parameter
>         Pollution" (HPP).
>         
>         Basically, it can be defined as the feasibility to override or
>         add HTTP
>         GET/POST parameters by injecting query string delimiters.
>         
>         In the last months, we have discovered several real world
>         flaws in which
>         HPP can be used to modify the application behaviors, access
>         uncontrollable variables and even bypass input validation
>         checkpoints
>         and WAFs rules.
>         
>         Exploiting such HPP vulnerabilities, we have found several
>         problems in
>         some Google Search Appliance front-end scripts, Ask.com,
>         Yahoo! Mail
>         Classic and many other products.
>         
>         If you are interested, you are kindly invited to have a look
>         at:
>         http://www.owasp.org/images/b/ba/AppsecEU09_CarettoniDiPaola_v0.8.pdf
>         
>         We're going to release additional materials in the next
>         future,
>         including a video of the Yahoo! attack vector.
>         
>         Stay tuned on http://blog.mindedsecurity.com and
>         http://blog.nibblesec.org
>         
>         Cheers,
>         Stefano Di Paola and Luca Carettoni
>         
>         --
>         Stefano Di Paola
>         Chief Technology Officer, LA/ISO27001
>         Minded Security Research Labs Director
>         
>         Minded Security - Application Security Consulting
>         
>         Official Site: www.mindedsecurity.com
>         
>         Personal Blog: www.wisec.it/sectou.php
>         ..................
>         
>         
>         
>         ----------------------------------------------------------------------------
>         Join us on IRC: irc.freenode.net #webappsec
>         
>         Have a question? Search The Web Security Mailing List
>         Archives:
>         http://www.webappsec.org/lists/websecurity/archive/
>         
>         Subscribe via RSS:
>         http://www.webappsec.org/rss/websecurity.rss [RSS Feed]
>         
>         Join WASC on LinkedIn
>         http://www.linkedin.com/e/gis/83336/4B20E4374DBA
>         
>
>
>
> -- 
> "Our deepest fear is not that we are inadequate. Our deepest fear is
> that we are powerful beyond measure. It is our light, not our
> darkness, that most frightens us. We ask ourselves, who am I to be
> brilliant, gorgeous, talented, and fabulous?Actually, who are you not
> to be? You are a child of God. Your playing small doesn't serve the
> world. There's nothing enlightened about shrinking so that other
> people won't feel insecure around you. We are all meant to shine, as
> children do. We are born to make manifest the glory of God that is
> within us. It's not just in some of us, it's in everyone. And as we
> let our own light shine, we unconsciously give other people permission
> to do the same. As we are liberated from our own fear, our presence
> automatically liberates others." --Nelson Mandela--
-- 
...oOOo...oOOo....
Stefano Di Paola
Software & Security Engineer

Owasp Italy R&D Director

Web: www.wisec.it
..................