CVE-2021-21261

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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."}, {"lang": "es", "value": "Flatpak es un sistema para crear, distribuir y ejecutar aplicaciones de escritorio en sandbox en Linux. Se detect\u00f3 un fallo en el servicio \"flatpak-portal\" que puede permitir que las aplicaciones en sandbox ejecuten c\u00f3digo arbitrario en el sistema host (un escape del sandbox). Este fallo de escape del sandbox est\u00e1 presente en las versiones 0.11.4 y anteriores a las versiones reparadas 1.8.5 y 1.10.0. El servicio D-Bus del portal Flatpak (\"flatpak-portal\", tambi\u00e9n conocido por su nombre de servicio D-Bus \"org.freedesktop.portal.Flatpak\") permite que las aplicaciones en un sandbox de Flatpak inicien sus propios subprocesos en una nueva instancia del sandbox, ya sea con la misma configuraci\u00f3n de seguridad que la persona que llama o con una configuraci\u00f3n de seguridad m\u00e1s restrictiva. Por ejemplo, esto se usa en navegadores web empaquetados con Flatpak, como Chromium, para iniciar subprocesos que procesar\u00e1n contenido web no confiable. y dar a esos subprocesos un sandbox m\u00e1s restrictivo que el propio navegador. En versiones vulnerables, el servicio del portal Flatpak pasa las variables de entorno especificadas por la persona que llama hacia procesos que no est\u00e1n en el sandbox en el sistema host y, en particular, al comando \"flatpak run\" que se usa para iniciar la nueva instancia del sandbox. Una aplicaci\u00f3n Flatpak maliciosa o comprometida podr\u00eda establecer variables de entorno en las que conf\u00ede el comando \"flatpak run\" y usarlas para ejecutar c\u00f3digo arbitrario que no se encuentra en un sandbox. Como soluci\u00f3n alternativa, esta vulnerabilidad puede ser mitigada evitando que se inicie el servicio \"flatpak-portal\", pero esa mitigaci\u00f3n impedir\u00e1 que muchas aplicaciones de Flatpak funcionen correctamente. Esto se corrige en las versiones 1.8.5 y 1.10.0"}], "lastModified": "2021-01-27T19:34:12.467", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "041D999E-622C-4771-9819-57C6F1BE7056", "versionEndExcluding": "1.8.5", "versionStartIncluding": "0.11.4"}, {"criteria": "cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FD8B7A39-7AB9-43AA-9B31-B2112B6D90CF", "versionEndExcluding": "1.10.0", "versionStartIncluding": "1.9.1"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}