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Date: Sat, 11 Jan 2014 23:40:07 +0100
From: Stefan Schurtz <sschurtz@...nline.de>
To: full-disclosure@...ts.grok.org.uk
Subject: Yahoo Bug Bounty Program Vulnerability #2 Open
	Redirect

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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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Download attachment "0x62DC6CC0.asc" of type "application/pgp-keys" (1800 bytes)

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