Debian: DSA-3895-1 Moderate: Flatpak Privilege Escalation Issue

It was discovered that Flatpak, an application deployment framework for
desktop apps insufficiently restricted file permissinons in third-party
repositories, which could result in privilege escalation.

For the stable distribution (stretch), this problem has been fixed in
version 0.8.5-2+deb9u1.

For the unstable distribution (sid), this problem has been fixed in
version 0.8.7-1.

We recommend that you upgrade your flatpak packages.

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/