[USN-4721-1] Flatpak vulnerability

Paulo Flabiano Smorigo pfsmorigo at canonical.com
Thu Feb 4 20:20:42 UTC 2021

Ubuntu Security Notice USN-4721-1
February 04, 2021

flatpak vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS


Flatpak could be made to crash or run programs if it received
specially crafted input.

Software Description:
- flatpak: Application deployment framework for desktop apps


Simon McVittieg discovered that flatpak-portal service allowed sandboxed
applications to execute arbitrary code on the host system (a sandbox
escape). A malicious user could create a Flatpak application that set
environment variables, trusted by the Flatpak "run" command, and use it
to execute arbitrary code outside the sandbox.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
  flatpak                         1.8.2-1ubuntu0.1
  libflatpak0                     1.8.2-1ubuntu0.1

Ubuntu 20.04 LTS:
  flatpak                         1.6.5-0ubuntu0.2
  libflatpak0                     1.6.5-0ubuntu0.2

Ubuntu 18.04 LTS:
  flatpak                         1.0.9-0ubuntu0.2
  libflatpak0                     1.0.9-0ubuntu0.2

In general, a standard system update will make all the necessary changes.


Package Information:
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