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Re: Mozilla Thunderbird : Multiple Information Disclosure Vulnerabilities
From: Daniel Veditz <dveditz () cruzio com>
Date: Tue, 28 Feb 2006 14:17:06 -0800

Renaud Lifchitz wrote:
Mozilla Thunderbird : Multiple Information Disclosure Vulnerabilities

We believe this to be a testing error. The problem of loading remote
iframe and css content was fixed prior to the release of Mozilla
Thunderbird 1.0

The testcase included in the advisory contains the iframe and css
content in-line with the message. That will always be shown as there is
no privacy issue with doing so and does not demonstrate the remote
loading issue claimed.

Once a user has pressed the "Show Images" button--not the best label
since it covers all remote content--that state is stored in the mailbox
metadata/index file (.msf) and the remote content will then be loaded on
future viewings. If the .msf file is not deleted between tests this
could give the appearance of the bug described in the advisory.

There is a minor residual privacy issue if people whose mail you keep
and reread are setting webbugs on you (your boss could find out how many
times you read his memo?), but in most cases your privacy is fully blown
once you load the remote content the first time.
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