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Bug 831087 (CVE-2021-43860, CVE-2022-21682) - <sys-apps/flatpak-{1.10.6, 1.12.3}: multiple vulnerabilities
Summary: <sys-apps/flatpak-{1.10.6, 1.12.3}: multiple vulnerabilities
Alias: CVE-2021-43860, CVE-2022-21682
Product: Gentoo Security
Classification: Unclassified
Component: Vulnerabilities (show other bugs)
Hardware: All Linux
: Normal minor (vote)
Assignee: Gentoo Security
Whiteboard: B4 [glsa+]
Depends on: 831266
  Show dependency tree
Reported: 2022-01-12 22:24 UTC by John Helmert III
Modified: 2023-12-23 09:08 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2022-01-12 22:24:30 UTC
CVE-2021-43860 (from URL):

"Ryan Gonzalez discovered that Flatpak doesn't properly validate that the permissions displayed to the user for an app at install time match the actual permissions granted to the app at runtime, in the case that there's a null byte in the metadata file of an app. Therefore apps can grant themselves permissions without the consent of the user."

Fix in 1.10.6, 1.12.3.
Comment 1 Larry the Git Cow gentoo-dev 2022-01-13 04:23:55 UTC
The bug has been referenced in the following commit(s):

commit d4b29f0c9489bbeddeff88ec2a8b445b9859fb68
Author:     Zac Medico <>
AuthorDate: 2022-01-13 04:16:48 +0000
Commit:     Zac Medico <>
CommitDate: 2022-01-13 04:23:50 +0000

    sys-apps/flatpak: Bump to version 1.10.6
    Package-Manager: Portage-3.0.30, Repoman-3.0.3
    Signed-off-by: Zac Medico <>

 sys-apps/flatpak/Manifest              |   1 +
 sys-apps/flatpak/flatpak-1.10.6.ebuild | 102 +++++++++++++++++++++++++++++++++
 2 files changed, 103 insertions(+)
Comment 2 Sam James archtester Gentoo Infrastructure gentoo-dev Security 2022-01-13 04:38:56 UTC too :)

Please stable when ready, thanks!
Comment 3 John Helmert III archtester Gentoo Infrastructure gentoo-dev Security 2022-01-13 23:39:30 UTC
CVE-2022-21682 (

Flatpak is a Linux application sandboxing and distribution framework. A path traversal vulnerability affects versions of Flatpak prior to 1.12.3 and 1.10.6. flatpak-builder applies `finish-args` last in the build. At this point the build directory will have the full access that is specified in the manifest, so running `flatpak build` against it will gain those permissions. Normally this will not be done, so this is not problem. However, if `--mirror-screenshots-url` is specified, then flatpak-builder will launch `flatpak build --nofilesystem=host appstream-utils mirror-screenshots` after finalization, which can lead to issues even with the `--nofilesystem=host` protection. In normal use, the only issue is that these empty directories can be created wherever the user has write permissions. However, a malicious application could replace the `appstream-util` binary and potentially do something more hostile. This has been resolved in Flatpak 1.12.3 and 1.10.6 by changing the behaviour of `--nofilesystem=home` and `--nofilesystem=host`.
Comment 4 Larry the Git Cow gentoo-dev 2023-12-23 09:06:02 UTC
The bug has been referenced in the following commit(s):

commit 774692af49b616797706937b258815617e132c83
Author:     GLSAMaker <>
AuthorDate: 2023-12-23 09:05:21 +0000
Commit:     Hans de Graaff <>
CommitDate: 2023-12-23 09:05:57 +0000

    [ GLSA 202312-12 ] Flatpak: Multiple Vulnerabilities
    Signed-off-by: GLSAMaker <>
    Signed-off-by: Hans de Graaff <>

 glsa-202312-12.xml | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)