01-26-2014 02:31 PM
Do you use the free email client Thunderbird? Do you also use Tor? If so, then there's been a security flaw awaiting a fix from Mozilla for over two years; now the bug has been publicly disclosed.Thunderbird security bug Mike Cardwell, a developer, IT consultant, sysadmin and security researcher in the UK, informed the Tor-talk mailing list about a security issue in the Thunderbird app.
Normally, when you click on a link in email, the link opens in your default web browser. Hopefully, you've all but weaponized your browser with extensions and addons to better protect your privacy and security. If you are using Tor, then you're going to a bit more trouble to protect yourself and you don't want your defenses bypassed. However, when blogging more details about the security leak in Thunderbird, Cardwell explained: "I've discovered a way of crafting a link such that when you're using Thunderbird and you click on that link, it opens the website in a new Thunderbird tab instead of in the external web browser."
In Cardwell's case, his "browser of choice is Firefox." He wrote:
"I have made various configuration changes and installed various addons in Firefox to enhance my security and privacy. Amongst other things, I use RequestPolicy, NoScript, RefControl, AdBlock, CipherFox, HTTPS-Everywhere, I have proxy settings and sometimes I use Tor. If a link opens in a Thunderbird tab instead of a Firefox tab, all of those defenses are bypassed.
Secondly, when the external website opens in a Thunderbird tab, there is no identifying chrome around the page which would allow the user to differentiate between a tab containing any other part of the Thunderbird interface and a malicious site which is spoofing part of the Thunderbird interface."
01-26-2014 02:41 PM
A flaw that has been known for 2 years and still not fixed?! That is not exactly reassuring about that mail client....
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