Arbitrary Code Injection Affecting flatpak-libs package, versions <0:1.0.9-10.amzn2.0.1


Severity

Recommended
0.0
high
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.14% (52nd percentile)

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  • Snyk IDSNYK-AMZN2-FLATPAKLIBS-1697736
  • published27 Sept 2021
  • disclosed11 Mar 2021

Introduced: 11 Mar 2021

CVE-2021-21381  (opens in a new tab)
CWE-74  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 flatpak-libs to version 0:1.0.9-10.amzn2.0.1 or higher.
This issue was patched in ALAS2-2021-1625.

NVD Description

Note: Versions mentioned in the description apply only to the upstream flatpak-libs package and not the flatpak-libs package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In Flatpack since version 0.9.4 and before version 1.10.2 has a vulnerability in the "file forwarding" feature which can be used by an attacker to gain access to files that would not ordinarily be allowed by the app's permissions. By putting the special tokens @@ and/or @@u in the Exec field of a Flatpak app's .desktop file, a malicious app publisher can trick flatpak into behaving as though the user had chosen to open a target file with their Flatpak app, which automatically makes that file available to the Flatpak app. This is fixed in version 1.10.2. A minimal solution is the first commit "Disallow @@ and @@U usage in desktop files". The follow-up commits "dir: Reserve the whole @@ prefix" and "dir: Refuse to export .desktop files with suspicious uses of @@ tokens" are recommended, but not strictly required. As a workaround, avoid installing Flatpak apps from untrusted sources, or check the contents of the exported .desktop files in exports/share/applications/*.desktop (typically ~/.local/share/flatpak/exports/share/applications/*.desktop and /var/lib/flatpak/exports/share/applications/*.desktop) to make sure that literal filenames do not follow @@ or @@u.

CVSS Scores

version 3.1