Improper Input Validation

Summary

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. Versions through 1.10.7, 1.11.1 through 1.12.7-1, 1.13.1 through 1.14.3-1, and 1.15.0 through 1.15.3 contain a vulnerability similar to CVE-2017-5226, but using the "TIOCLINUX" ioctl command instead of "TIOCSTI". If a Flatpak app is run on a Linux virtual console such as "/dev/tty1", it can copy text from the virtual console and paste it into the command buffer, from which the command might be run after the Flatpak app has exited. Ordinary graphical terminal emulators like xterm, gnome-terminal, and Konsole are unaffected. This vulnerability is specific to the Linux virtual consoles "/dev/tty1", "/dev/tty2", and so on. As a workaround, don't run Flatpak on a Linux virtual console. Flatpak is primarily designed to be used in a Wayland or X11 graphical environment.