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EulerOS 2.0 SP8 : flatpak (EulerOS-SA-2021-2460)

high Nessus Plugin ID 153653

Synopsis

The remote EulerOS host is missing a security update.

Description

According to the versions of the flatpak packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

 - 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`. (CVE-2021-21381)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected flatpak packages.

See Also

http://www.nessus.org/u?2a3cb23e

Plugin Details

Severity: High

ID: 153653

File Name: EulerOS_SA-2021-2460.nasl

Version: 1.2

Type: local

Published: 9/24/2021

Updated: 9/24/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.1

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:N

CVSS Score Source: CVE-2021-21381

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.1

Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:huawei:euleros:flatpak, p-cpe:/a:huawei:euleros:flatpak-libs, cpe:/o:huawei:euleros:2.0

Required KB Items: Host/local_checks_enabled, Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/sp

Excluded KB Items: Host/EulerOS/uvp_version

Exploit Ease: No known exploits are available

Patch Publication Date: 9/24/2021

Vulnerability Publication Date: 3/10/2021

Reference Information

CVE: CVE-2021-21381