Re: Yahoo Bug Bounty Program Vulnerability #2 Open Redirect

["Kenneth F. Belva" <full-disclosure () silverbackventuresllc com>]

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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_______________________________________________
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Charter: http://lists.grok.org.uk/full-disclosure-charter.html
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