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Yahoo! Open Redirect

Yahoo! Open Redirect
Posted Jan 12, 2014
Authored by Stefan Schurtz

The piggyback parameter on ads.yahoo.com is prone to an open redirect vulnerability. Yahoo! addressed this by simply not fixing it and removing it from the bug bounty scope.

tags | exploit
SHA-256 | 50c6a4f2d1b103f3063eff08517e16411735828edf4dfd0f56e57844ec8da341

Yahoo! 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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