CVE-2021-21261
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-21261
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-21261.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-21261
- Aliases
-
- GHSA-4ppf-fxf6-vxg2
- Related
- Published
- 2021-01-14T20:15:12Z
- Modified
- 2024-09-18T03:12:57.221045Z
- Severity
-
- 8.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. A bug was discovered in the
flatpak-portalservice 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 1.10.0. The Flatpak portal D-Bus service (flatpak-portal, also known by its D-Bus service nameorg.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 theflatpak runcommand that is used to launch the new sandbox instance. A malicious or compromised Flatpak app could set environment variables that are trusted by theflatpak runcommand, and use them to execute arbitrary code that is not in a sandbox. As a workaround, this vulnerability can be mitigated by preventing theflatpak-portalservice from starting, but that mitigation will prevent many Flatpak apps from working correctly. This is fixed in versions 1.8.5 and 1.10.0. - References
-
- https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2
- https://security.gentoo.org/glsa/202101-21
- https://www.debian.org/security/2021/dsa-4830
- https://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486
- https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8b
- https://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4
- https://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eaba
- https://github.com/flatpak/flatpak/releases/tag/1.8.5
- https://security-tracker.debian.org/tracker/CVE-2021-21261
Affected packages
Debian:11 / flatpak
Package
- Name
- flatpak
- Purl
- pkg:deb/debian/flatpak?arch=source
Debian:12 / flatpak
Package
- Name
- flatpak
- Purl
- pkg:deb/debian/flatpak?arch=source
Debian:13 / flatpak
Package
- Name
- flatpak
- Purl
- pkg:deb/debian/flatpak?arch=source
Git / github.com/flatpak/flatpak
Affected ranges
- Type
- GIT
- Repo
- https://github.com/flatpak/flatpak
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixedFixedFixed