A thunderbird security update has been released for Debian GNU/Linux 9 LTS to address multiple security issues in Thunderbird, which may lead to the execution of arbitrary code or denial of service.

DLA 2408-1: thunderbird security update

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Debian LTS Advisory DLA-2408-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Emilio Pozuelo Monfort
October 17, 2020   https://wiki.debian.org/LTS
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Package : thunderbird
Version : 1:78.3.1-2~deb9u1
CVE ID : CVE-2020-15673 CVE-2020-15676 CVE-2020-15677 CVE-2020-15678

Multiple security issues have been found in Thunderbird, which may lead
to the execution of arbitrary code or denial of service.

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/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