| Description: | Flatpak is a system for building, distributing, and running sandboxed
desktop applications on Linux. In Flatpack since version 0.9.4 and
before version 1.10.2 has a vulnerability in the "file forwarding"
feature which can be used by an attacker to gain access to files that
would not ordinarily be allowed by the app's permissions. By putting
the special tokens `@@` and/or `@@u` in the Exec field of a Flatpak
app's .desktop file, a malicious app publisher can trick flatpak into
behaving as though the user had chosen to open a target file with
their Flatpak app, which automatically makes that file available to
the Flatpak app. This is fixed in version 1.10.2. A minimal solution
is the first commit "`Disallow @@ and @@U usage in desktop files`".
The follow-up commits "`dir: Reserve the whole @@ prefix`" and "`dir:
Refuse to export .desktop files with suspicious uses of @@ tokens`"
are recommended, but not strictly required. As a workaround, avoid
installing Flatpak apps from untrusted sources, or check the contents
of the exported `.desktop` files in
`exports/share/applications/*.desktop` (typically
`~/.local/share/flatpak/exports/share/applications/*.desktop` and
`/var/lib/flatpak/exports/share/applications/*.desktop`) to make sure
that literal filenames do not follow `@@` or `@@u`.
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