Debian: DSA-4390-1 Moderate: Flatpak Privilege Escalation

It was discovered that Flatpak, an application deployment framework for
desktop apps, insufficiently restricted the execution of "apply_extra"
scripts which could potentially result in privilege escalation.

For the stable distribution (stretch), this problem has been fixed in
version 0.8.9-0+deb9u2.

We recommend that you upgrade your flatpak packages.

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

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