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Gentoo: GLSA-202101-21 Normal: Flatpak Sandbox Escape Analysis

gentoo
Calendar Grey January 24, 2021
Dist Gentoo Esm H88
Explore a Gentoo security notice concerning Flatpak that reveals a critical flaw enabling remote code execution through a potential sandbox breach.
A vulnerability was discovered in Flatpak which could allow a remote attacker to execute arbitrary code.

Summary

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).

Topics%20covered

Topics Covered

security advisory Gentoo gentoo arbitrary code execution remote execution normal severity sandbox escape remote attacker Normal flatpak Flatpak

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
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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.

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

Topics%20covered

Topics Covered

security advisory Gentoo gentoo arbitrary code execution remote execution normal severity sandbox escape remote attacker Normal flatpak Flatpak

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.

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Affected Packages

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

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.

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