cve-2024-42472
Vulnerability from cvelistv5
Published
2024-08-15 18:32
Modified
2024-08-15 20:06
Severity ?
10.0 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Summary
Flatpak may allow access to files outside sandbox for certain apps
References
security-advisories@github.comhttps://github.com/containers/bubblewrap/commit/68e75c3091c87583c28a439b45c45627a94d622c
security-advisories@github.comhttps://github.com/containers/bubblewrap/commit/a253257cd298892da43e15201d83f9a02c9b58b5
security-advisories@github.comhttps://github.com/flatpak/flatpak/commit/2cdd1e1e5ae90d7c3a4b60ce2e36e4d609e44e72
security-advisories@github.comhttps://github.com/flatpak/flatpak/commit/3caeb16c31a3ed62d744e2aaf01d684f7991051a
security-advisories@github.comhttps://github.com/flatpak/flatpak/commit/6bd603f6836e9b38b9b937d3b78f3fbf36e7ff75
security-advisories@github.comhttps://github.com/flatpak/flatpak/commit/7c63e53bb2af0aae9097fd2edfd6a9ba9d453e97
security-advisories@github.comhttps://github.com/flatpak/flatpak/commit/8a18137d7e80f0575e8defabf677d81e5cc3a788
security-advisories@github.comhttps://github.com/flatpak/flatpak/commit/db3a785241fda63bf53f0ec12bb519aa5210de19
security-advisories@github.comhttps://github.com/flatpak/flatpak/security/advisories/GHSA-7hgv-f2j8-xw87
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2024/08/14/6
Impacted products
Vendor Product Version
Show details on NVD website

To clipboard 

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Antes de las versiones 1.14.0 y 1.15.10, una aplicaci\u00f3n Flatpak maliciosa o comprometida que utilizaba directorios persistentes pod\u00eda acceder y escribir archivos fuera de lo que de otro modo tendr\u00eda acceso, lo cual es un ataque a la integridad y la confidencialidad. Cuando se usa `persistent=subdir` en los permisos de la aplicaci\u00f3n (representado como `--persist=subdir` en la interfaz de l\u00ednea de comandos), eso significa que una aplicaci\u00f3n que de otro modo no tendr\u00eda acceso al directorio de inicio del usuario real ver\u00e1 un directorio de inicio vac\u00edo con un subdirectorio grabable `subdir`. Detr\u00e1s de escena, este directorio es en realidad un montaje de enlace y los datos se almacenan en el directorio por aplicaci\u00f3n como `~/.var/app/$APPID/subdir`. Esto permite que las aplicaciones existentes que no conocen el directorio por aplicaci\u00f3n sigan funcionando seg\u00fan lo previsto sin acceso general al directorio de inicio. Sin embargo, la aplicaci\u00f3n tiene acceso de escritura al directorio de la aplicaci\u00f3n `~/.var/app/$APPID` donde est\u00e1 almacenado este directorio. Si el directorio de origen para la opci\u00f3n `persistent`/`--persist` se reemplaza por un enlace simb\u00f3lico, la pr\u00f3xima vez que se inicie la aplicaci\u00f3n, el montaje del enlace seguir\u00e1 el enlace simb\u00f3lico y montar\u00e1 lo que sea que apunte en el sandbox. Se puede proporcionar protecci\u00f3n parcial contra esta vulnerabilidad parcheando Flatpak usando los parches en las confirmaciones ceec2ffc y 98f79773. Sin embargo, esto deja una condici\u00f3n de ejecuci\u00f3n que podr\u00eda ser aprovechada por dos instancias de una aplicaci\u00f3n maliciosa que se ejecutan en paralelo. Cerrar la condici\u00f3n de ejecuci\u00f3n requiere actualizar o parchear la versi\u00f3n de bubblewrap que usa Flatpak para agregar la nueva opci\u00f3n `--bind-fd` usando el parche y luego parchear Flatpak para usarlo. Si Flatpak se configur\u00f3 en el momento de la compilaci\u00f3n con `-Dsystem_bubbl\u00e9wrap=bwrap` (1.15.x) o `--with-system-bubblewrap=bwrap` (1.14.x o anterior), o una opci\u00f3n similar, entonces la versi\u00f3n de El bubblewrap que necesita parchearse es una copia del sistema que se distribuye por separado, normalmente `/usr/bin/bwrap`. Esta configuraci\u00f3n es la que se utiliza normalmente en las distribuciones de Linux. Si Flatpak se configur\u00f3 en el momento de la compilaci\u00f3n con `-Dsystem_bubbewrap=` (1.15.x) o con `-- without-system-bubblewrap` (1.14.x o anterior), entonces se incluye la versi\u00f3n empaquetada de bubblewrap. con Flatpak que hay que parchear. Normalmente se instala como `/usr/libexec/flatpak-bwrap`. Esta configuraci\u00f3n es la predeterminada cuando se construye a partir del c\u00f3digo fuente. Para la rama estable 1.14.x, estos cambios se incluyen en Flatpak 1.14.10. La versi\u00f3n empaquetada de bubblewrap incluida en esta versi\u00f3n se actualiz\u00f3 a 0.6.3. Para la rama de desarrollo 1.15.x, estos cambios se incluyen en Flatpak 1.15.10. La versi\u00f3n incluida de bubblewrap en esta versi\u00f3n es un subproyecto \\\"wrap\\\" de Meson, que se actualiz\u00f3 a 0.10.0. Las ramas 1.12.x y 1.10.x no se actualizar\u00e1n para esta vulnerabilidad. Las distribuciones de SO con soporte a largo plazo deben respaldar los cambios individuales en sus versiones de Flatpak y bubblewrap, o actualizar a versiones m\u00e1s nuevas si su pol\u00edtica de estabilidad lo permite. Como workaround, evite el uso de aplicaciones que utilicen el permiso \\\"persistente\\\" (`--persist`).\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N\",\"baseScore\":10.0,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":5.8}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-74\"}]}],\"references\":[{\"url\":\"https://github.com/containers/bubblewrap/commit/68e75c3091c87583c28a439b45c45627a94d622c\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/containers/bubblewrap/commit/a253257cd298892da43e15201d83f9a02c9b58b5\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/flatpak/flatpak/commit/2cdd1e1e5ae90d7c3a4b60ce2e36e4d609e44e72\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/flatpak/flatpak/commit/3caeb16c31a3ed62d744e2aaf01d684f7991051a\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/flatpak/flatpak/commit/6bd603f6836e9b38b9b937d3b78f3fbf36e7ff75\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/flatpak/flatpak/commit/7c63e53bb2af0aae9097fd2edfd6a9ba9d453e97\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/flatpak/flatpak/commit/8a18137d7e80f0575e8defabf677d81e5cc3a788\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/flatpak/flatpak/commit/db3a785241fda63bf53f0ec12bb519aa5210de19\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/flatpak/flatpak/security/advisories/GHSA-7hgv-f2j8-xw87\",\"source\":\"security-advisories@github.com\"},{\"url\":\"http://www.openwall.com/lists/oss-security/2024/08/14/6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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