{"id":"OESA-2021-1043","summary":"flatpak security update","details":"flatpak is a system for building, distributing and running sandboxed desktop applications on Linux. See https://wiki.gnome.org/Projects/SandboxedApps for more information.\r\n\r\nSecurity Fix(es):\r\n\r\nFlatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. A bug was discovered in the `flatpak-portal` service that can allow sandboxed applications to execute arbitrary code on the host system (a sandbox escape). This sandbox-escape bug is present in versions from 0.11.4 and before fixed versions 1.8.5 and 1.9.4. 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. As a workaround, this vulnerability can be mitigated by preventing the `flatpak-portal` service from starting, but that mitigation will prevent many Flatpak apps from working correctly. This is fixed in versions 1.8.5 and 1.9.4.(CVE-2021-21261)","modified":"2025-09-03T06:17:15.130891Z","published":"2021-03-05T11:02:37Z","upstream":["CVE-2021-21261"],"database_specific":{"severity":"High"},"references":[{"type":"ADVISORY","url":"https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1043"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21261"}],"affected":[{"package":{"name":"flatpak","ecosystem":"openEuler:20.03-LTS","purl":"pkg:rpm/openEuler/flatpak&distro=openEuler-20.03-LTS"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.3-3.oe1"}]}],"ecosystem_specific":{"x86_64":["flatpak-devel-1.0.3-3.oe1.x86_64.rpm","flatpak-debugsource-1.0.3-3.oe1.x86_64.rpm","flatpak-debuginfo-1.0.3-3.oe1.x86_64.rpm","flatpak-1.0.3-3.oe1.x86_64.rpm","flatpak-devel-1.0.3-3.oe1.x86_64.rpm","flatpak-debugsource-1.0.3-3.oe1.x86_64.rpm","flatpak-debuginfo-1.0.3-3.oe1.x86_64.rpm","flatpak-1.0.3-3.oe1.x86_64.rpm"],"aarch64":["flatpak-debugsource-1.0.3-3.oe1.aarch64.rpm","flatpak-debuginfo-1.0.3-3.oe1.aarch64.rpm","flatpak-devel-1.0.3-3.oe1.aarch64.rpm","flatpak-1.0.3-3.oe1.aarch64.rpm","flatpak-debugsource-1.0.3-3.oe1.aarch64.rpm","flatpak-debuginfo-1.0.3-3.oe1.aarch64.rpm","flatpak-devel-1.0.3-3.oe1.aarch64.rpm","flatpak-1.0.3-3.oe1.aarch64.rpm"],"src":["flatpak-1.0.3-3.oe1.src.rpm","flatpak-1.0.3-3.oe1.src.rpm"],"noarch":["flatpak-help-1.0.3-3.oe1.noarch.rpm","flatpak-help-1.0.3-3.oe1.noarch.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2021-1043.json"}},{"package":{"name":"flatpak","ecosystem":"openEuler:20.03-LTS-SP1","purl":"pkg:rpm/openEuler/flatpak&distro=openEuler-20.03-LTS-SP1"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.0.3-3.oe1"}]}],"ecosystem_specific":{"x86_64":["flatpak-devel-1.0.3-3.oe1.x86_64.rpm","flatpak-debugsource-1.0.3-3.oe1.x86_64.rpm","flatpak-debuginfo-1.0.3-3.oe1.x86_64.rpm","flatpak-1.0.3-3.oe1.x86_64.rpm"],"aarch64":["flatpak-debugsource-1.0.3-3.oe1.aarch64.rpm","flatpak-debuginfo-1.0.3-3.oe1.aarch64.rpm","flatpak-devel-1.0.3-3.oe1.aarch64.rpm","flatpak-1.0.3-3.oe1.aarch64.rpm"],"src":["flatpak-1.0.3-3.oe1.src.rpm"],"noarch":["flatpak-help-1.0.3-3.oe1.noarch.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2021-1043.json"}}],"schema_version":"1.7.3"}