CVE-2021-21381

2021-03-1204:16:27

redhat.com

access.redhat.com

8.2 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

5.8 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:P/I:P/A:N

0.001 Low

EPSS

Percentile

49.7%

JSON

A sandbox escape flaw was found in the way flatpak handled special tokens in “.desktop” files. This flaw allows an attacker to gain access to files that are not ordinarily allowed by the app’s permissions. The highest threat from this vulnerability is to confidentiality and integrity.

Mitigation

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.