CVE-2021-21261 - log back

CVE-2021-21261 edited at 14 Jan 2021 21:36:11
References
https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2
https://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486
https://github.com/flatpak/flatpak/commit/821249844bbb7e52cbf4508b4de18c05e8592220
https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8b
https://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4
https://github.com/flatpak/flatpak/commit/39a5621e6941b9d27bf89b63e8fb6cad6e279e53
https://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eaba
https://github.com/flatpak/flatpak/commit/d19f6c330aa42e17df6dc36d12b6f4dfa507dbb3
- https://github.com/flatpak/flatpak/commit/4ac11066908ddb62a456c8dbdfa11cce643e9e11
- https://github.com/flatpak/flatpak/commit/e2c4ded323161f47609d0af97d00019d04a635f1
- https://github.com/flatpak/flatpak/commit/b0aea9c0533f8338ead9acb8dd2a65e6339b9a99
- https://github.com/flatpak/flatpak/commit/4108e022452303093d8b90c838695a0476cb09c7
- https://github.com/flatpak/flatpak/commit/c4a58d5822e86f82bbf9e2e7702153a51cc6841b
CVE-2021-21261 edited at 14 Jan 2021 21:32:25
Severity
- Unknown
+ High
Remote
- Unknown
+ Local
Type
- Unknown
+ Sandbox escape
Description
+ 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 the 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
+ https://github.com/flatpak/flatpak/security/advisories/GHSA-4ppf-fxf6-vxg2
+ https://github.com/flatpak/flatpak/commit/6d1773d2a54dde9b099043f07a2094a4f1c2f486
+ https://github.com/flatpak/flatpak/commit/821249844bbb7e52cbf4508b4de18c05e8592220
+ https://github.com/flatpak/flatpak/commit/6e5ae7a109cdfa9735ea7ccbd8cb79f9e8d3ae8b
+ https://github.com/flatpak/flatpak/commit/aeb6a7ab0abaac4a8f4ad98b3df476d9de6b8bd4
+ https://github.com/flatpak/flatpak/commit/39a5621e6941b9d27bf89b63e8fb6cad6e279e53
+ https://github.com/flatpak/flatpak/commit/cc1401043c075268ecc652eac557ef8076b5eaba
+ https://github.com/flatpak/flatpak/commit/d19f6c330aa42e17df6dc36d12b6f4dfa507dbb3
+ https://github.com/flatpak/flatpak/commit/4ac11066908ddb62a456c8dbdfa11cce643e9e11
+ https://github.com/flatpak/flatpak/commit/e2c4ded323161f47609d0af97d00019d04a635f1
+ https://github.com/flatpak/flatpak/commit/b0aea9c0533f8338ead9acb8dd2a65e6339b9a99
+ https://github.com/flatpak/flatpak/commit/4108e022452303093d8b90c838695a0476cb09c7
+ https://github.com/flatpak/flatpak/commit/c4a58d5822e86f82bbf9e2e7702153a51cc6841b
Notes
+ 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.
CVE-2021-21261 created at 14 Jan 2021 21:25:05