This is about http://efail.de, a vulnerability in multiple email clients, including Thunderbird + Enigmail, which allows exfiltrating plaintext of GPG encrypted emails.
What we know so far:
- The enigmail version we ship (1.9.9) seems to be affected, and there don’t seem to be any security patches to the Debian package after the 1.9.9 release.
- According to this, Thunderbird doesn’t have patches released yet
- We could be saved by Torbirdy, because, according to the EFAIL website, “the most prominent way of attacking EFAIL” uses HTML, and Torbirdy completely disables HTML.
Feature Branch: feature/15091-thunderbird-60