Gentoo: GLSA-202101-21: Flatpak: Sandbox escape

Date 24 Jan 2021

Category Gentoo Linux Distribution - Security Advisories

142

Posted By LinuxSecurity Advisories

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

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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
=================

    -------------------------------------------------------------------
     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
This email address is being protected from spambots. You need JavaScript enabled to view it. 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