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Subject: phpMyID can act as a redirector and as headers injector

Credits: Raphael Geissert <atomo64 (at) gmail (dot) com [email concealed]>

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 site would

try to know whether the user is authenticated at the identity provider, and

the identity does not exist, the user would be redirected to whatever site

is specified (or inject headers, when php << 4.4.2 or php >= 5 && << 5.1.2).

Impact:

A user can be tricked and redirected to its vulnerable identity provider,

place where the user will be redirected (and/or headers will be injected).

Example exploit:

MyID.php?openid_return_to=http://www.ecocho.com&openid_mode=checkid_imme
diate

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