flatpak-builder can access files outside the build directory.
概要
flatpak-builder can access files outside the build directory.
原文の説明
取得元が公開している説明をそのまま載せています (多くは英語)。
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.
出典: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
ディストリビューション別の修正状況
各ディストリビューションが公開している、この CVE の修正パッケージ
- Debian DEBIAN-CVE-2022-21682 flatpak 修正版: 1.10.7-0+deb11u1
参照URL
- advisory github.com
- advisory github.com
- advisory lists.fedoraproject.org
- advisory lists.fedoraproject.org
- advisory nvd.nist.gov
- advisory security.gentoo.org
- advisory debian.org
- patch github.com
- patch github.com