Date: Fri, 17 Mar 2023 09:56:55 +0000 From: Simon McVittie <smcv@...ian.org> To: oss-security@...ts.openwall.com Subject: flatpak: CVE-2023-28100: TIOCLINUX can send commands outside sandbox if running on a virtual console https://github.com/flatpak/flatpak/security/advisories/GHSA-7qpw-3vjv-xrqp Vulnerable: all < 1.10.8, 1.12.x < 1.12.8, 1.14.x < 1.14.4, 1.15.x < 1.15.4 Fixed: 1.15.4, 1.14.x >= 1.14.4, 1.12.x >= 1.12.8, 1.10.x >= 1.10.8 Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. Jakub Wilk mentioned on the oss-security mailing list that various projects' mitigations for the problematic design of the TIOCSTI ioctl are not sufficient in all cases, because Linux virtual terminals implement copy/paste via the TIOCLINUX ioctl, which can have a similar effect. Flatpak is one of the projects affected by this. If a malicious Flatpak app is run on a Linux virtual console such as /dev/tty1, it can copy text from the virtual console and paste it back into the virtual console's input buffer, from which the command might be run by the user's shell after the Flatpak app has exited. This is similar to CVE-2017-5226, but using the TIOCLINUX ioctl command instead of TIOCSTI. This has been fixed in Flatpak upstream releases 1.14.4, 1.15.4, 1.12.8 and 1.10.8 by preventing the TIOCLINUX ioctl via a seccomp filter, in the same way that was already done for the TIOCSTI ioctl. Mitigation: 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, which are not commonly used to run Flatpak apps: Flatpak is primarily designed to be used in a Wayland or X11 graphical environment, either with no controlling terminal (the most common case) or from a graphical terminal emulator (while debugging or developing). Workaround: avoid running untrusted Flatpak apps (`flatpak run ...`) from the text-mode virtual consoles.
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