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CVE-2021-21261

Status Candidate

Overview

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. 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). This sandbox-escape bug is present in versions from 0.11.4 and before fixed versions 1.8.5 and 1.10.0. The Flatpak portal D-Bus service (`flatpak-portal`, also known by its D-Bus service name `org.freedesktop.portal.Flatpak`) allows apps in a Flatpak sandbox to launch their own subprocesses in a new sandbox instance, either with the same security settings as the caller or with more restrictive security settings. For example, this is used in Flatpak-packaged web browsers such as Chromium to launch subprocesses that will process untrusted web content, and give those subprocesses a more restrictive sandbox than the browser itself. In vulnerable versions, the Flatpak portal service passes caller-specified environment variables to non-sandboxed processes on the host system, and in particular to the `flatpak run` command that is used to launch the new sandbox instance. A malicious or compromised Flatpak app could set environment variables that are trusted by the `flatpak run` command, and use them to execute arbitrary code that is not in a sandbox. 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. This is fixed in versions 1.8.5 and 1.10.0.

Related Files

Ubuntu Security Notice USN-4721-1
Posted Feb 4, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4721-1 - Simon McVittieg discovered that flatpak-portal service allowed sandboxed applications to execute arbitrary code on the host system. A malicious user could create a Flatpak application that set environment variables, trusted by the Flatpak "run" command, and use it to execute arbitrary code outside the sandbox.

tags | advisory, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-21261
MD5 | 8fdb1b95064080911e8061c372c4f26b
Download | Favorite | View
Red Hat Security Advisory 2021-0411-01
Posted Feb 4, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0411-01 - Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-21261
MD5 | 3f9a486913db94bb805224707703dfcc
Download | Favorite | View
Red Hat Security Advisory 2021-0307-01
Posted Feb 1, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0307-01 - Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-21261
MD5 | 857ba634ee43a300313a02074d82881e
Download | Favorite | View
Red Hat Security Advisory 2021-0306-01
Posted Feb 1, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0306-01 - Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-21261
MD5 | 640ccfdd86d0449485ff80f9bf3726bd
Download | Favorite | View
Red Hat Security Advisory 2021-0304-01
Posted Feb 1, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0304-01 - Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux.

tags | advisory
systems | linux, redhat
advisories | CVE-2021-21261
MD5 | 37c9ebeb7ce7e1d664df547999485d4b
Download | Favorite | View
Gentoo Linux Security Advisory 202101-21
Posted Jan 25, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202101-21 - A vulnerability was discovered in Flatpak which could allow a remote attacker to execute arbitrary code. Versions less than 1.10.0 are affected.

tags | advisory, remote, arbitrary
systems | linux, gentoo
advisories | CVE-2021-21261
MD5 | 35be11b975ae4a3d5f625c07cd1912c7
Download | Favorite | View
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