flatpak-builder can access files outside the build directory.
Summary
flatpak-builder can access files outside the build directory.
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2022-21682 flatpak Fixed in: 1.10.7-0+deb11u1
References
- 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