Important: flatpak

Issue Overview:

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)

Affected Packages:

flatpak

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update flatpak to update your system.

New Packages:

aarch64:  
    flatpak-1.0.9-10.amzn2.0.2.aarch64  
    flatpak-builder-1.0.0-10.amzn2.0.2.aarch64  
    flatpak-devel-1.0.9-10.amzn2.0.2.aarch64  
    flatpak-libs-1.0.9-10.amzn2.0.2.aarch64  
    flatpak-debuginfo-1.0.9-10.amzn2.0.2.aarch64  
  
i686:  
    flatpak-1.0.9-10.amzn2.0.2.i686  
    flatpak-builder-1.0.0-10.amzn2.0.2.i686  
    flatpak-devel-1.0.9-10.amzn2.0.2.i686  
    flatpak-libs-1.0.9-10.amzn2.0.2.i686  
    flatpak-debuginfo-1.0.9-10.amzn2.0.2.i686  
  
src:  
    flatpak-1.0.9-10.amzn2.0.2.src  
  
x86_64:  
    flatpak-1.0.9-10.amzn2.0.2.x86_64  
    flatpak-builder-1.0.0-10.amzn2.0.2.x86_64  
    flatpak-devel-1.0.9-10.amzn2.0.2.x86_64  
    flatpak-libs-1.0.9-10.amzn2.0.2.x86_64  
    flatpak-debuginfo-1.0.9-10.amzn2.0.2.x86_64  

Additional References

Red Hat: CVE-2021-41133

Mitre: CVE-2021-41133