NewStart CGSL CORE 5.05 / MAIN 5.05 : flatpak Vulnerability (NS-SA-2022-0043)

high Nessus Plugin ID 160864


The remote NewStart CGSL host is affected by a vulnerability.


The remote NewStart CGSL host, running version CORE 5.05 / MAIN 5.05, has flatpak packages installed that are affected by a vulnerability:

- 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 Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade the vulnerable CGSL flatpak packages. Note that updated packages may not be available yet. Please contact ZTE for more information.

See Also

Plugin Details

Severity: High

ID: 160864

File Name: newstart_cgsl_NS-SA-2022-0043_flatpak.nasl

Version: 1.2

Type: local

Published: 5/10/2022

Updated: 5/10/2022

Risk Information


Risk Factor: Medium

Score: 6.3


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


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:zte:cgsl_core:flatpak, p-cpe:/a:zte:cgsl_core:flatpak-builder, p-cpe:/a:zte:cgsl_core:flatpak-debuginfo, p-cpe:/a:zte:cgsl_core:flatpak-devel, p-cpe:/a:zte:cgsl_core:flatpak-libs, p-cpe:/a:zte:cgsl_main:flatpak, p-cpe:/a:zte:cgsl_main:flatpak-builder, p-cpe:/a:zte:cgsl_main:flatpak-debuginfo, p-cpe:/a:zte:cgsl_main:flatpak-devel, p-cpe:/a:zte:cgsl_main:flatpak-libs, cpe:/o:zte:cgsl_core:5, cpe:/o:zte:cgsl_main:5

Required KB Items: Host/local_checks_enabled, Host/ZTE-CGSL/release, Host/ZTE-CGSL/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 5/8/2022

Vulnerability Publication Date: 3/10/2021

Reference Information

CVE: CVE-2021-21381