[ASA-202103-4] flatpak: sandbox escape
foxboron at archlinux.org
Sat Mar 20 12:14:27 UTC 2021
Arch Linux Security Advisory ASA-202103-4
Date : 2021-03-13
CVE-ID : CVE-2021-21381
Package : flatpak
Type : sandbox escape
Remote : No
Link : https://security.archlinux.org/AVG-1678
The package flatpak before version 1.10.2-1 is vulnerable to sandbox
Upgrade to 1.10.2-1.
# pacman -Syu "flatpak>=1.10.2-1"
The problem has been fixed upstream in version 1.10.2.
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 malicious app publisher can escape the sandbox to access sensitive
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