Home / mailings [gentoo-announce] [ GLSA 202101-21 ] Flatpak: Sandbox escape
Posted on 25 January 2021
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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
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