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Message-Id: <200810012008.10856.atomo64@gmail.com>
Date: Wed, 1 Oct 2008 20:08:06 -0500
From: Raphael Geissert <atomo64@...il.com>
To: bugtraq@...urityfocus.com
Subject: XSS vulnerability in phpMyID

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Hash: SHA1

Subject: XSS vulnerability in phpMyID
Credits: Raphael Geissert <atomo64@...il.com>
Release date: 2008-10-27
Affects: v0.9 [23-Jul-2008]

Resources:
    * Homepage: http://siege.org/projects/phpMyID/
    * Demo: http://phpmyid.com

Background:
    phpMyID is a single user OpenID identity provider implemented in PHP.

Problem description:
    The MyID.php script does not sanitize the input it is supposed to be given
    by the site where the user wants to be authenticated. When the return_to
    address does not have the same "root" as trust_root it aborts, opening a
    hole for XSS attacks. 

Impact:
    A user can be tricked and redirected to its vulnerable identity provider,
    place where the specially crafted data exploits the security hole.

Example exploit:
    MyID.php?openid_mode=checkid_immediate&openid_return_to=bar
	    &openid_trust_root=%3Cscript%3Ewindow.alert%28%29%3B%3C%2Fscript%3E
	    &openid_identity=foo
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