A firejail security update has been released for Debian GNU/Linux 9 LTS to address two vulnerabilities.

DLA 2336-1: firejail security update

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Debian LTS Advisory DLA-2336-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
August 22, 2020   https://wiki.debian.org/LTS
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Package : firejail
Version : 0.9.44.8-2+deb9u1
CVE ID : CVE-2020-17367 CVE-2020-17368

Tim Starling discovered two vulnerabilities in firejail, a sandbox
program to restrict the running environment of untrusted applications.

CVE-2020-17367

It was reported that firejail does not respect the end-of-options
separator ("--"), allowing an attacker with control over the command
line options of the sandboxed application, to write data to a
specified file.

CVE-2020-17368

It was reported that firejail when redirecting output via --output
or --output-stderr, concatenates all command line arguments into a
single string that is passed to a shell. An attacker who has control
over the command line arguments of the sandboxed application could
take advantage of this flaw to run run arbitrary other commands.

For Debian 9 stretch, these problems have been fixed in version
0.9.44.8-2+deb9u1.

We recommend that you upgrade your firejail packages.

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

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