full-disclosure - Re: Paypal XSS Vulnerability

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Message-ID: <3A7B293F6935E447ADF7D9E2A1CD972E9169E1DAC1@DEN-MEXMS-001.corp.ebay.com>
Date: Fri, 26 Mar 2010 20:49:07 -0600
From: "Orbeton, Jon" <jorbeton@...pal.com>
To: "full-disclosure@...ts.grok.org.uk" <full-disclosure@...ts.grok.org.uk>
Subject: Re: Paypal XSS Vulnerability - Resolved

All:

The XSS vulnerability reported below was addressed at approximately 17:45 PDT today. 

For information about how to report security issues to PayPal, please refer to the PayPal Responsible Disclosure Policy documented here:
https://www.paypal.com/cgi-bin/webscr?cmd=xpt/cps/securitycenter/general/ReportingSecurityIssues-outside

Site security issues should be reported to:
  sitesecurity@...pal.com

All reports will be handled professionally and quickly. A PGP key is available at the URL above.

Thanks,
Jon Orbeton

PayPal, an eBay Company

============================================

From: Wesley Kerfoot <wjak56 () gmail com>
Date: Fri, 26 Mar 2010 15:46:09 -0400

Paypal is affected by an XSS vulnerability where it fails to validate
input for the following url:

https://www.paypal.com/xclick/business=

One can add arbitrary javascript with no need for any filter evasion.

    https://www.paypal.com/xclick/business=<script> alert("xss"); </script>

As far as I know only the above url is affected. All of the usual XSS
attacks will work with this.

Cheers.

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