Oracle Linux: CVE-2019-10063: ELSA-2019-1143: flatpak security update (IMPORTANT) (Multiple Advisories)

Description

Flatpak before 1.0.8, 1.1.x and 1.2.x before 1.2.4, and 1.3.x before 1.3.1 allows a sandbox bypass. Flatpak versions since 0.8.1 address CVE-2017-5226 by using a seccomp filter to prevent sandboxed apps from using the TIOCSTI ioctl, which could otherwise be used to inject commands into the controlling terminal so that they would be executed outside the sandbox after the sandboxed app exits. This fix was incomplete: on 64-bit platforms, the seccomp filter could be bypassed by an ioctl request number that has TIOCSTI in its 32 least significant bits and an arbitrary nonzero value in its 32 most significant bits, which the Linux kernel would treat as equivalent to TIOCSTI. An incomplete fix for CVE-2017-5226 was found in flatpak. A sandbox bypass flaw was found in the way bubblewrap, which is used for sandboxing flatpak applications handled the TIOCSTI ioctl. A malicious flatpak application could use this flaw to inject commands into the controlled terminal of the host after the flatpak applications exits. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.