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. Reference: https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q
Created flatpak tracking bugs for this issue: Affects: fedora-all [bug 2012246]
As per link: https://github.com/flatpak/flatpak/security/advisories/GHSA-67h7-w3jq-vh4q Patches The short-term solution is to expand the deny-list of syscalls in the seccomp filter: e26ac75 89ae9fe 26b1248 a10f52a 9766ee0 4c34815 1330662 462fca2
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2021:4042 https://access.redhat.com/errata/RHSA-2021:4042
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2021-41133
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2021:4044 https://access.redhat.com/errata/RHSA-2021:4044
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.1 Extended Update Support Via RHSA-2021:4106 https://access.redhat.com/errata/RHSA-2021:4106
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.2 Extended Update Support Via RHSA-2021:4107 https://access.redhat.com/errata/RHSA-2021:4107