[ZH2005-14SA] Phishing problems on MSN

Date: July 1th 2005

Author:Giovanni Delvecchio

email: badpenguin@zone-h.org



Overview
=======
Multiple phishing problems exist on support.msn.com, permitting to a 
possible attacker to conduct phishing attack against a user.


Details
=====
1)Input passed to the "ru" parameter in "pplogin.aspx" isn't properly
sanitised before being returned to the user


Example:

http://support.msn.com/pplogin.aspx?ru=http://www.evil- 
site.com">www.msn.com/

or

http://support.msn.com/pplogin.aspx?ru=%68%74%74%70%3A%2F%2F%77%77%77% 
2E%65%76%69%6C%2D%73%69%74%65%2E%63%6F%6D%22%3E%77%77%77%2E%6D%73%6E% 
2E%63%6F%6D/

The problem has been fixed today.

Here is possible see a screen shot:
http://www.zone-h.org/files/49/msn1.jpg



2)Input passed to the 'mspplogin' parameter isn't properly sanitised, and by
using specialy crafted URL an attacker can cause the user to be redirected
to an arbitrary URL for the passport authentication.


Example:
http://support.msn.com/pplogin.aspx?msppchlg=1&mspplogin=http://www.evil-site.com/login.srf%3F

This problem at the moment has not been fixed.



Reference
=======
http://www.zone-h.org/advisories/read/id=7764

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