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Firefox 2.0 security bug: Extensions can hide themself
From: "azurIt" <azurit () pobox sk>
Date: Sun, 10 Dec 2006 16:45:28 +0100

Firefox is very popular and secure web browser. Until now, it is used by
millions of people and thousands of internet clubs. One of the great features of
Firefox are extensions. You can use them to create things inside your browser
which are beyond your imagination.

Every Firefox extensions developer knows the 'hidden' property of 'install
manifest'. This property can be used to hide _globally_ installed extensions and
it can't hide only local extension (this is a design feature so the extensions
installed by users can't be hidden). But it is not known that this can be
easily bypassed..

Did you know that you can't trust to what Extensions manager is saying ? For
detailed information look at the function 'hide_me()' in file
'src/chrome/content/ffsniff/ffsniffOverlay_orig.js' of my PoC.

Proof of Concept
As a PoC I updated my Firefox sniffer extension (FFsniFF) so now it has the
ability to hide itself. You can download it here:

The new version (0.2) was tested _only_ with Firefox 2.0 (both linux and

FFsniFF is a simple Firefox extension, which transforms your browser into the
html form sniffer. Every time the user click on 'Submit' button, FFsniFF will try
to find a non-blank password field in the form. If it's found, entire form (also
with URL) is sent to the specified e-mail address. It also has the ability to
hide itself from 'Extensions manager'.

There's no solution for this problem at this time.

azurIt, azurIt () IRCnet, azurit (at) pobox (dot) sk

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