Debian 9: DLA-2408-1 Moderate: Thunderbird Code Execution Threat

Debian follows the Thunderbird upstream releases. Support for the 68.x
series has ended, so starting with this update we're now following
the 78.x releases.

The 78.x series discontinues support for some addons. Also, starting
with 78, Thunderbird supports OpenPGP natively. If you are currently
using the Enigmail addon for PGP, please refer to the included NEWS
and README.Debian.gz files for information on how to migrate your
keys.

For Debian 9 stretch, these problems have been fixed in version
1:78.3.1-2~deb9u1.

We recommend that you upgrade your thunderbird packages.

For the detailed security status of thunderbird please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/thunderbird

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS