The remote CentOS Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:0411 advisory.

  - 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.

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CentOS 7 : flatpak (RHSA-2021:0411)

high Nessus Plugin ID 146315

Version 1.4