GLSA 202101-21: Flatpak: Sandbox escape

http://security.gentoo.org/

Severity:	normal
Title:	Flatpak: Sandbox escape
Date:	01/25/2021
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	Architecture(s)
sys-apps/flatpak	< 1.10.0	>= 1.10.0	All supported architectures

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

CVE-2021-21261

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-202101-21.xml

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.