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NewStart CGSL MAIN 6.02 : flatpak Vulnerability (NS-SA-2021-0122)
high Nessus Plugin ID 154499
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Synopsis
The remote NewStart CGSL host is affected by a vulnerability.Description
The remote NewStart CGSL host, running version MAIN 6.02, has flatpak packages installed that are affected by a vulnerability:- Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. A bug was discovered in the `flatpak-portal` service that can allow sandboxed applications to execute arbitrary code on the host system (a sandbox escape). This sandbox-escape bug is present in versions from 0.11.4 and before fixed versions 1.8.5 and 1.10.0. The Flatpak portal D-Bus service (`flatpak-portal`, also known by its D-Bus service name `org.freedesktop.portal.Flatpak`) allows apps in a Flatpak sandbox to launch their own subprocesses in a new sandbox instance, either with the same security settings as the caller or with more restrictive security settings. For example, this is used in Flatpak-packaged web browsers such as Chromium to launch subprocesses that will process untrusted web content, and give those subprocesses a more restrictive sandbox than the browser itself. In vulnerable versions, the Flatpak portal service passes caller-specified environment variables to non-sandboxed processes on the host system, and in particular to the `flatpak run` command that is used to launch the new sandbox instance. A malicious or compromised Flatpak app could set environment variables that are trusted by the `flatpak run` command, and use them to execute arbitrary code that is not in a sandbox. As a workaround, this vulnerability can be mitigated by preventing the `flatpak-portal` service from starting, but that mitigation will prevent many Flatpak apps from working correctly. This is fixed in versions 1.8.5 and 1.10.0. (CVE-2021-21261)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.
Solution
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: 154499
File Name: newstart_cgsl_NS-SA-2021-0122_flatpak.nasl
Version: 1.2
Type: local
Published: 10/27/2021
Updated: 10/27/2021
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 6.5
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 5.3
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2021-21261
CVSS v3
Risk Factor: High
Base Score: 8.8
Temporal Score: 7.7
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:zte:cgsl_main:flatpak-tests-debuginfo, p-cpe:/a:zte:cgsl_main:flatpak, p-cpe:/a:zte:cgsl_main:flatpak-debuginfo, cpe:/o:zte:cgsl_main:6, p-cpe:/a:zte:cgsl_main:flatpak-libs-debuginfo, p-cpe:/a:zte:cgsl_main:flatpak-debugsource, p-cpe:/a:zte:cgsl_main:flatpak-devel, p-cpe:/a:zte:cgsl_main:flatpak-tests, p-cpe:/a:zte:cgsl_main:flatpak-libs, p-cpe:/a:zte:cgsl_main:flatpak-session-helper, p-cpe:/a:zte:cgsl_main:flatpak-session-helper-debuginfo, p-cpe:/a:zte:cgsl_main:flatpak-selinux
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: 9/24/2021
Vulnerability Publication Date: 1/14/2021
Reference Information
CVE: CVE-2021-21261