{"id":"ALPINE-CVE-2021-41133","details":"Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In versions prior to 1.10.4 and 1.12.0, Flatpak apps with direct access to AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can trick portals and other host-OS services into treating the Flatpak app as though it was an ordinary, non-sandboxed host-OS process. They can do this by manipulating the VFS using recent mount-related syscalls that are not blocked by Flatpak's denylist seccomp filter, in order to substitute a crafted `/.flatpak-info` or make that file disappear entirely. Flatpak apps that act as clients for AF_UNIX sockets such as those used by Wayland, Pipewire or pipewire-pulse can escalate the privileges that the corresponding services will believe the Flatpak app has. Note that protocols that operate entirely over the D-Bus session bus (user bus), system bus or accessibility bus are not affected by this. This is due to the use of a proxy process `xdg-dbus-proxy`, whose VFS cannot be manipulated by the Flatpak app, when interacting with these buses. Patches exist for versions 1.10.4 and 1.12.0, and as of time of publication, a patch for version 1.8.2 is being planned. There are no workarounds aside from upgrading to a patched version.","modified":"2026-11-03T06:31:46.667580703Z","published":"2021-10-08T14:15:08.723Z","upstream":["CVE-2021-41133"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2021-41133"}],"affected":[{"package":{"name":"flatpak","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/flatpak?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.10.5-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-41133.json"}},{"package":{"name":"flatpak","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/flatpak?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.12.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-41133.json"}},{"package":{"name":"flatpak","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/flatpak?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.12.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-41133.json"}},{"package":{"name":"flatpak","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/flatpak?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.12.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-41133.json"}},{"package":{"name":"flatpak","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/flatpak?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.12.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-41133.json"}},{"package":{"name":"flatpak","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/flatpak?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.12.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-41133.json"}},{"package":{"name":"flatpak","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/flatpak?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.12.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-41133.json"}},{"package":{"name":"flatpak","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/flatpak?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.12.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-41133.json"}},{"package":{"name":"flatpak","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/flatpak?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.12.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-41133.json"}},{"package":{"name":"flatpak","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/flatpak?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.12.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-41133.json"}},{"package":{"name":"flatpak","ecosystem":"Alpine:v3.24","purl":"pkg:apk/alpine/flatpak?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.10.0"},{"fixed":"1.12.2-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-41133.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}