CVE-2021-21261
Vulnerability from cvelistv5
Published
2021-01-14 19:40
Modified
2024-08-03 18:09
Severity ?
7.3 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Summary
Flatpak 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 1.10.0. 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 1.10.0.
References
security-advisories@github.comhttps://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8bPatch, Third Party Advisory
security-advisories@github.comhttps://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4Patch, Third Party Advisory
security-advisories@github.comhttps://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eabaThird Party Advisory
security-advisories@github.comhttps://github.com/flatpak/flatpak/releases/tag/1.8.5Third Party Advisory
security-advisories@github.comhttps://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2Third Party Advisory
security-advisories@github.comhttps://security.gentoo.org/glsa/202101-21Third Party Advisory
security-advisories@github.comhttps://www.debian.org/security/2021/dsa-4830Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8bPatch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eabaThird Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/flatpak/flatpak/releases/tag/1.8.5Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202101-21Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2021/dsa-4830Third Party Advisory
Impacted products
Vendor Product Version
flatpak flatpak Version: >= 0.11.4, < 1.8.5
Version: >= 1.9.0, < 1.10.0
 Create a notification for this product.
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   },
}


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Security Advisory comment format.

This schema specifies the format of a comment related to a security advisory.

UUIDv4 of the comment
UUIDv4 of the Vulnerability-Lookup instance
When the comment was created originally
When the comment was last updated
Title of the comment
Description of the comment
The identifier of the vulnerability (CVE ID, GHSA-ID, PYSEC ID, etc.).



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Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.