high
7.7
CWE
22
Advisory Published
Updated

CVE-2022-21682: flatpak-builder can access files outside the build directory.

First published: Thu Jan 13 2022(Updated: )

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`.

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
Flatpak Flatpak<1.10.7
Flatpak Flatpak>=1.11.1<1.12.4
Flatpak Flatpak-builder<1.2.2
Fedoraproject Fedora=35
Redhat Enterprise Linux=8.0
Debian Debian Linux=9.0
Debian Debian Linux=10.0
Debian Debian Linux=11.0
debian/flatpak<=1.2.5-0+deb10u4
1.10.8-0+deb11u1
1.10.7-0+deb11u1
1.14.4-1
1.14.5-1

Remedy

https://github.com/flatpak/flatpak/commit/445bddeee657fdc8d2a0a1f0de12975400d4fc1a

Remedy

https://github.com/flatpak/flatpak/commit/4d11f77aa7fd3e64cfa80af89d92567ab9e8e6fa

Remedy

https://github.com/flatpak/flatpak/security/advisories/GHSA-8ch7-5j3h-g4fx

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Reference Links

Frequently Asked Questions

  • What is CVE-2022-21682?

    CVE-2022-21682 is a path traversal vulnerability in Flatpak, a Linux application sandboxing and distribution framework.

  • Which versions of Flatpak are affected by CVE-2022-21682?

    Versions of Flatpak prior to 1.12.3 and 1.10.6 are affected by CVE-2022-21682.

  • What is the severity of CVE-2022-21682?

    The severity of CVE-2022-21682 is high, with a CVSS score of 6.5.

  • How can I fix CVE-2022-21682?

    To fix CVE-2022-21682, you should update Flatpak to version 1.12.3 or 1.10.6 or later.

  • Where can I find more information about CVE-2022-21682?

    More information about CVE-2022-21682 can be found in the Flatpak security advisories on GitHub.

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