This does not work if you are using the FireFox 1.0 tabbed browsing
feature, as your pop up window simply opens a new tab, and it then
becomes immediately obvious what you are trying to pull off here.
-----Original Message-----
From: full-disclosure-bounces@lists.netsys.com
[mailto:full-disclosure-
bounces@lists.netsys.com]
Sent: Monday, January 10, 2005 6:22 PM
To: full-disclosure@lists.netsys.com; bugtraq@securityfocus.com;
NTBUGTRAQ@listserv.ntbugtraq.com
Subject: [Full-Disclosure] Firespoofing [Firefox 1.0]
__Summary
Using javascript it is possible to spoof the content of security and
download dialogs by partly covering them with a popup window. This can
fool
a user to download and automaticly execute a file (if a file extension
association exists) or to grant a script local data access (if
codebase
principals are enabled).
__Expected Behavior
Modal dialogs should always be on top and it should not be possible to
obfuscate their appearance.
__Proof-of-Concept
http://www.mikx.de/firespoofing/
The PoC is designed for Firefox 1.0 running in a maximized window.
Part 1 - download dialog spoofing
Shows how to cover a download dialog and fool the user to execute a
file
with a standard windows file association (in this case a .ht file).
BTW,
remember the latest .ht buffer overflow...
Part 2 - security dialog spoofing
Shows how to cover a security dialog. Make sure codebase principals
are
enabled (not default but encouraged by many XUL sites). Creates the
file
c:\booom.txt to proof local system access.
__Status
The bug is confirmed but currently unfixed (open for more than 3
months).
As
a partial workaround set dom.disable_window_flip to true in
about:config.
The vendor failed to respond to multiple status requests which led to
this
public disclosure.
2004-09-20 Vendor informed (bugzilla.mozilla.org #260560)
2004-09-20 Vendor confirmed bug
2004-10-20 Status request (open for 1 month - no reply)
2005-01-03 Status request (open for 3 months - no reply)
2005-01-07 Status request (disclosure warning - no reply)
2005-01-11 Public disclosure
__Affected Software
Tested with Firefox 1.0, Mozilla 1.7.5 and Netscape 7.1 on Windows XP
SP2.
__Contact Informations
Michael Krax <mikx@mikx.de>
http://www.mikx.de/?p=7
mikx
_______________________________________________
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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.netsys.com/full-disclosure-charter.html
