full-disclosure - Sun Java Plugin arbitrary package access vulnerability

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From: ju at heisec.de (Juergen Schmidt)
Subject: Sun Java Plugin arbitrary package access
 vulnerability

On Tue, 23 Nov 2004, Jouko Pynnonen wrote:

>  [script language=javascript]
>  var c=document.applets[0].getClass().forName('sun.text.Utility');
>  alert('got Class object: '+c)
>  [/script]

I implemented a short demonstration out of this. It works with 1.4.2_05
and IE/Mozilla.

I tried this with Debian (unstable, j2re1.4) which uses a Java "1.4.1"
from Blackdown.
It does not work.
Does this mean Blackdowns Java is not vulnerable? Or is testing for
"sun.text.Utility" not adequate for this.

The class sun.text.Utility is present in rt.jar.

bye, ju

-- 
Juergen Schmidt       Chefredakteur  heise Security     www.heisec.de
Heise Zeitschriften Verlag,    Helstorferstr. 7,       D-30625 Hannover
Tel. +49 511 5352 300      FAX +49 511 5352 417       EMail ju@...sec.de
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