Arch Linux Security Advisory ASA-202103-4 ========================================= Severity: Medium Date : 2021-03-13 CVE-ID : CVE-2021-21381 Package : flatpak Type : sandbox escape Remote : No Link : https://security.archlinux.org/AVG-1678 Summary ======= The package flatpak before version 1.10.2-1 is vulnerable to sandbox escape. Resolution ========== Upgrade to 1.10.2-1. # pacman -Syu "flatpak>=1.10.2-1" The problem has been fixed upstream in version 1.10.2. Workaround ========== None. Description =========== 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. Impact ====== A malicious app publisher can escape the sandbox to access sensitive files. References ========== https://github.com/flatpak/flatpak/security/advisories/GHSA-xgh4-387p-hqpp https://github.com/flatpak/flatpak/issues/4146 https://github.com/flatpak/flatpak/pull/4156 https://github.com/flatpak/flatpak/commit/8279c5818425b6812523e3805bbe242fb6... https://security.archlinux.org/CVE-2021-21381