A Flatpak security update has been released for Gentoo Linux.

GLSA 202101-21 : Flatpak: Sandbox escape

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Gentoo Linux Security Advisory GLSA 202101-21
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  https://security.gentoo.org/
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Severity: Normal
Title: Flatpak: Sandbox escape
Date: January 25, 2021
Bugs: #765457
ID: 202101-21

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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
================
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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
security@gentoo.org 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