- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 202101-21
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                           https://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

 Severity: Normal
    Title: Flatpak: Sandbox escape
     Date: January 25, 2021
     Bugs: #765457
       ID: 202101-21

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
========

A vulnerability was discovered in Flatpak which could allow a remote
attacker to execute arbitrary code.

Background
==========

Flatpak is a Linux application sandboxing and distribution framework.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  sys-apps/flatpak             < 1.10.0                  >= 1.10.0

Description
===========

A bug was discovered in the flatpak-portal service that can allow
sandboxed applications to execute arbitrary code on the host system (a
sandbox escape).

Impact
======

A remote attacker could entice a user to open a specially crafted
Flatpak app possibly resulting in execution of arbitrary code with the
privileges of the process or a Denial of Service condition.

Workaround
==========

As a workaround, this vulnerability can be mitigated by preventing the
flatpak-portal service from starting, but that mitigation will prevent
many Flatpak apps from working correctly. It is highly recommended to
upgrade.

Resolution
==========

All Flatpak users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=sys-apps/flatpak-1.10.0"

References
==========

[ 1 ] CVE-2021-21261
      https://nvd.nist.gov/vuln/detail/CVE-2021-21261

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/202101-21

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
[email protected] or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2021 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5