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CVE-2022-21682

Status Candidate

Overview

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`.

Related Files

Gentoo Linux Security Advisory 202312-12
Posted Dec 26, 2023
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202312-12 - Several vulnerabilities have been found in Flatpack, the worst of which lead to privilege escalation and sandbox escape. Versions greater than or equal to 1.14.4 are affected.

tags | advisory, vulnerability
systems | linux, gentoo
advisories | CVE-2021-21381, CVE-2021-41133, CVE-2021-43860, CVE-2022-21682, CVE-2023-28100, CVE-2023-28101
SHA-256 | 3018a3aaac2e8e504bce240edb2f33466f227c0b15ee1ce0adb6bbddcdceb2ca
Red Hat Security Advisory 2022-7458-01
Posted Nov 8, 2022
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2022-7458-01 - Flatpak-builder is a tool for building flatpaks from sources.

tags | advisory
systems | linux, redhat
advisories | CVE-2022-21682
SHA-256 | 5be4f5c9b26f014ff8aec5920b6f412dfa096daa6b529d5f98cab135eb161c8f
Debian Security Advisory 5049-1
Posted Jan 28, 2022
Authored by Debian | Site debian.org

Debian Linux Security Advisory 5049-1 - Several vulnerabilities were discovered in Flatpak, an application deployment framework for desktop apps.

tags | advisory, vulnerability
systems | linux, debian
advisories | CVE-2021-43860, CVE-2022-21682
SHA-256 | 92ec776b2618348db8f0707414a1552a17ec2b3bdae5344ada8ee04019205861
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