flatpak: sandbox escape via spawn portal

A flaw was found in Flatpak. The Flatpak portal D-Bus service passes caller-specified environment variables to non-sandboxed processes on the host system, and in particular to the flatpak run command that is used to launch the new sandbox instance. A malicious or compromised Flatpak app could set...

CVE-2021-21261: Improper Neutralization of Special Elements in Output Used by a Downstream Component

Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. A bug was discovered in the flatpak-portal service that can allow sandboxed applications to execute arbitrary code on the host system a sandbox escape. This sandbox-escape bug is present in versio...