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Re: Yahoo Bug Bounty Program Vulnerability #2 Open Redirect
From: Stefan Schurtz <sschurtz () t-online de>
Date: Mon, 13 Jan 2014 13:38:09 +0100

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Hi Kenneth,

thanks for your information.

I make it public because it seems a open redirect isn't a problem or
bug for Yahoo! Security. And as you can see in my advisory or on the
Yahoo Bug Bounty page, open redirects are removed from scope. And I'm
not sure, this will be fixed soon.

Kind regards,
Stefan

Am 12.01.2014 00:59, schrieb Kenneth F. Belva:
Just as an FYI, I also reported this exact bug to Yahoo! in
November on 11/21/2013 as part of the BugBash at OWASP AppSecUSA
2013 through BugCrowd, prior to your December 13th disclosure date
to Yahoo.

As part of my discussions with Yahoo! Security on this issue I was
told that it was reported to them before my 11/21/13 disclosure.

It is currently not fixed and, in the interest of responsible 
disclosure, I did not wish to make it public until the appropriate
time.

Ken


On 01/11/2014 05:40 PM, Stefan Schurtz wrote:
Advisory:            Yahoo Bug Bounty Program Vulnerability #2 Open
Redirect Advisory ID:                SSCHADV2013-YahooBB-002 Author:                 Stefan
Schurtz Affected Software:   Successfully tested on ads.yahoo.com 
Vendor URL:          http://yahoo.com Vendor Status:         informed

========================== Vulnerability Description 
==========================

The 'piggyback'-Parameter on "http://ads.yahoo.com"; is prone to
an Open Redirect

========================== PoC-Exploit 
==========================

http://ads.yahoo.com/pixel?id=2454131&t=2&piggyback=http%3a//www.google.de&_msig=10r7s21mt&rmxbkn=26&_cbv=187571889



==========================
Solution ==========================

-

========================== Disclosure Timeline 
==========================

13-Dec-2013 - vendor informed by contact form (Yahoo Bug Bounty
Program) 31-Dec-2013 - next message to the Yahoo Security
Contact 04-Jan-2014 - feedback from vendor 04-Jan-2014 - vendor
informed again about the three vulnerabilities 06-Jan-2014 -
Feedback from vendor - Open redirects are no longer in scope of
the Bug Bounty program

========================== Credits ==========================

Vulnerability found and advisory written by Stefan Schurtz.

========================== References ==========================

http://yahoo.com 
http://www.darksecurity.de/advisories/BugBounty2013/yahoo/SSCHADV2013-YahooBB-002.tx





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