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    Debian: DSA-4830-1: flatpak security update

    Date 14 Jan 2021
    268
    Posted By LinuxSecurity Advisories
    Simon McVittie discovered a bug in the flatpak-portal service that can allow sandboxed applications to execute arbitrary code on the host system (a sandbox escape).
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    Debian Security Advisory DSA-4830-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                       Moritz Muehlenhoff
    January 14, 2021                      https://www.debian.org/security/faq
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    Package        : flatpak
    CVE ID         : not yet available
    
    Simon McVittie discovered a bug in the flatpak-portal service that can
    allow sandboxed applications to execute arbitrary code on the host system
    (a sandbox escape).
    
    The Flatpak portal D-Bus service (flatpak-portal, also known by its
    D-Bus service name org.freedesktop.portal.Flatpak) allows apps in a
    Flatpak sandbox to launch their own subprocesses in a new sandbox
    instance, either with the same security settings as the caller or
    with more restrictive security settings. For example, this is used in
    Flatpak-packaged web browsers such as Chromium to launch subprocesses
    that will process untrusted web content, and give those subprocesses a
    more restrictive sandbox than the browser itself.
    
    In vulnerable versions, the Flatpak portal 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
    environment variables that are trusted by the flatpak run command, and
    use them to execute arbitrary code that is not in a sandbox.
    
    For the stable distribution (buster), this problem has been fixed in
    version 1.2.5-0+deb10u2.
    
    We recommend that you upgrade your flatpak packages.
    
    For the detailed security status of flatpak please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/flatpak
    
    Further information about Debian Security Advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://www.debian.org/security/
    
    Mailing list: This email address is being protected from spambots. You need JavaScript enabled to view it.
    

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