CVE-2021-21381

CVE Details

Release Date:2021-03-11

Description


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.

See more information about CVE-2021-21381 from MITRE CVE dictionary and NIST NVD


CVSS v3.0 metrics


NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score: 8.2 Base Metrics: AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
Access Vector: Local network Attack Complexity: Low
Privileges Required: None User Interaction: Required
Scope: Changed Confidentiality Impact: High
Integrity Impact: High Availability Impact: None

Errata information


PlatformErrataRelease Date
Oracle Linux version 7 (flatpak)ELSA-2021-10022021-03-29
Oracle Linux version 8 (flatpak)ELSA-2021-10682021-04-07



This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team

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