full-disclosure - New (19.10.05) MS-IE Url Spoofing bug (by K-Gen).

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Message-ID: <efcd93940510200249h2f13c78nee03ad18495863ee@mail.gmail.com>
Date: Thu Oct 20 17:58:27 2005
From: alphakgen at gmail.com (K-Gen Gen)
Subject: New (19.10.05) MS-IE Url Spoofing bug (by K-Gen).

New (19.10.05) MS-IE Url Spoofing bug (by K-Gen).

Gr337s .. I (K-Gen) have found a new (I think..) URL spoofing bug in IE.

Affected : All MS-IE Browsers (Win XP SP2 as well).

This allows a malicious website to host a specially crafted A HREF tag
that shows to the user
as a link to one location, but actually redirects to another. This can
be used in Phishing scams
and other malicious attacks.

The basic idea here is to write a geniune <a href=""> </a>tag but
include an onClick event handeler
that will redirect (window.location="";) to another page. The next
example won't work:

<a href="http://microsoft.com"
onClick="window.location='http://google.com';">Microsoft</a>

Probably there is some protection in IE .. but not enough :)

If we try the next thing:

<a href="http://microsoft.com" onClick="alert()">Microsoft</a>

An alert WILL pop-up before redirecting. The same thing will happen to
the document.write("");
method, it will execute before redirection.

Hence, the next Proof of Concept:

<a href="http://microsoft.com"
onClick="document.write(unescape('%3cscript%3ewindow.location=%27http://google.com%27%3c/script%3e'))">Microsoft</a>

Put the code into an HTML page and see for yourself. In the status bar
and in the properties the
link appears as http://microsoft.com , but if you click on the link it
will redirect you to
http://google.com .

I used unescape becuse characters like < > and ' cause run-time errors...

This is not extremely critical as the old %01@ bug (That still works
on my IE sp1 :lol:), becuase
It does not obscure the real link in the Address bar, but i bet there
will be a PoC for this one too, sooner or later...

Have a Nice Day.
K-Gen