Yahoo Bug Bounty Program Vulnerability #2 Open Redirect

[Stefan Schurtz <sschurtz () t-online de>]

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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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