Directory Traversal Affecting flatpak-session-helper package, versions <0:1.12.4-1.amzn2022


Severity

Recommended
medium

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.27% (68th percentile)

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  • Snyk IDSNYK-AMZN2022-FLATPAKSESSIONHELPER-2995447
  • published29 Aug 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 Amazon-Linux:2022 flatpak-session-helper to version 0:1.12.4-1.amzn2022 or higher.
This issue was patched in ALAS2022-2022-021.

NVD Description

Note: Versions mentioned in the description apply only to the upstream flatpak-session-helper package and not the flatpak-session-helper package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2022 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