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Huawei EulerOS: CVE-2022-21682: flatpak security update

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Huawei EulerOS: CVE-2022-21682: flatpak security update

Severity
4
CVSS
(AV:N/AC:L/Au:S/C:N/I:P/A:N)
Published
01/13/2022
Created
03/30/2022
Added
03/29/2022
Modified
03/29/2022

Description

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`.

Solution(s)

  • huawei-euleros-2_0_sp8-upgrade-flatpak
  • huawei-euleros-2_0_sp8-upgrade-flatpak-libs

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