The remote CentOS Linux 7 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2021:4044 advisory.

  - Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In     versions prior to 1.10.4 and 1.12.0, Flatpak apps with direct access to AF_UNIX sockets such as those used     by Wayland, Pipewire or pipewire-pulse can trick portals and other host-OS services into treating the     Flatpak app as though it was an ordinary, non-sandboxed host-OS process. They can do this by manipulating     the VFS using recent mount-related syscalls that are not blocked by Flatpak's denylist seccomp filter, in     order to substitute a crafted `/.flatpak-info` or make that file disappear entirely. Flatpak apps that act     as clients for AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can escalate the     privileges that the corresponding services will believe the Flatpak app has. Note that protocols that     operate entirely over the D-Bus session bus (user bus), system bus or accessibility bus are not affected     by this. This is due to the use of a proxy process `xdg-dbus-proxy`, whose VFS cannot be manipulated by     the Flatpak app, when interacting with these buses. Patches exist for versions 1.10.4 and 1.12.0, and as     of time of publication, a patch for version 1.8.2 is being planned. There are no workarounds aside from     upgrading to a patched version. (CVE-2021-41133)

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-2021:4044)

high Nessus Plugin ID 155550

Version 1.3