Directory Traversal Affecting flatpak package, versions <1.12.3-1


Severity

Recommended
0.0
medium
0
10

Snyk's Security Team recommends NVD's CVSS assessment. Learn more

Threat Intelligence

EPSS
0.33% (72nd percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications

Snyk Learn

Learn about Directory Traversal vulnerabilities in an interactive lesson.

Start learning
  • Snyk IDSNYK-DEBIAN13-FLATPAK-5680273
  • published14 Jan 2022
  • disclosed13 Jan 2022

Introduced: 13 Jan 2022

CVE-2022-21682  (opens in a new tab)
CWE-22  (opens in a new tab)

How to fix?

Upgrade Debian:13 flatpak to version 1.12.3-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream flatpak package and not the flatpak package as distributed by Debian. See How to fix? for Debian:13 relevant fixed versions and status.

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.

CVSS Scores

version 3.1