{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-05-11T11:32:14.863","vulnerabilities":[{"cve":{"id":"CVE-2021-21381","sourceIdentifier":"security-advisories@github.com","published":"2021-03-11T17:15:12.703","lastModified":"2024-11-21T05:48:14.423","vulnStatus":"Modified","cveTags":[],"descriptions":[{"lang":"en","value":"Flatpak is a system for building, distributing, and running sandboxed desktop applications on Linux. In Flatpack since version 0.9.4 and before version 1.10.2 has a vulnerability in the \"file forwarding\" feature which can be used by an attacker to gain access to files that would not ordinarily be allowed by the app's permissions. By putting the special tokens `@@` and/or `@@u` in the Exec field of a Flatpak app's .desktop file, a malicious app publisher can trick flatpak into behaving as though the user had chosen to open a target file with their Flatpak app, which automatically makes that file available to the Flatpak app. This is fixed in version 1.10.2. A minimal solution is the first commit \"`Disallow @@ and @@U usage in desktop files`\". The follow-up commits \"`dir: Reserve the whole @@ prefix`\" and \"`dir: Refuse to export .desktop files with suspicious uses of @@ tokens`\" are recommended, but not strictly required. As a workaround, avoid installing Flatpak apps from untrusted sources, or check the contents of the exported `.desktop` files in `exports/share/applications/*.desktop` (typically `~/.local/share/flatpak/exports/share/applications/*.desktop` and `/var/lib/flatpak/exports/share/applications/*.desktop`) to make sure that literal filenames do not follow `@@` or `@@u`."},{"lang":"es","value":"Flatpak es un sistema para construir, distribuir y ejecutar aplicaciones de escritorio en sandbox en Linux. En Flatpack desde la versión 0.9.4 y anteriores a la versión 1.10.2, presenta una vulnerabilidad en la funcionalidad \"file forwarding\" que puede ser usada por un atacante para conseguir acceso a archivos que normalmente no estarían permitidos por los permisos de la aplicación. Colocando los tokens especiales \"@@\" y/o \"@@u\" en el campo Exec del archivo .desktop de una aplicación Flatpak, un editor de aplicaciones malicioso puede engañar a Flatpak para que se comporte como si el usuario hubiera elegido abrir un archivo de destino con su aplicación Flatpak, lo que automáticamente hace que ese archivo esté disponible para la aplicación Flatpak. Esto ha sido corregido en versión 1.10.2. Una solución mínima es el primer commit \"`Disallow @@ and @@U usage in desktop files`\". El siguiente commit \"`dir: Reserve the whole @@ prefix`\" y \"`dir: Refuse to export .desktop files with suspicious uses of @@ tokens`\" se recomiendan, pero no son estrictamente necesarias. Como solución, evite instalar aplicaciones Flatpak de fuentes no fiables, o compruebe el contenido de los archivos exportados \".desktop\" en \"exports/share/applications/*.desktop\" (normalmente \"~/.local/share/flatpak/exports/share/applications/*.desktop\" y \"/var/lib/flatpak/exports/share/applications/*.desktop\") para asegurarse de que los nombres literales de los archivos no siguen \"@@\" o \"@@u\""}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N","baseScore":7.1,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"LOW","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":1.8,"impactScore":4.7},{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N","baseScore":8.2,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":1.8,"impactScore":5.8}],"cvssMetricV2":[{"source":"nvd@nist.gov","type":"Primary","cvssData":{"version":"2.0","vectorString":"AV:N/AC:M/Au:N/C:P/I:P/A:N","baseScore":5.8,"accessVector":"NETWORK","accessComplexity":"MEDIUM","authentication":"NONE","confidentialityImpact":"PARTIAL","integrityImpact":"PARTIAL","availabilityImpact":"NONE"},"baseSeverity":"MEDIUM","exploitabilityScore":8.6,"impactScore":4.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":true}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-74"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:flatpak:flatpak:*:*:*:*:*:*:*:*","versionStartIncluding":"0.9.4","versionEndExcluding":"1.10.2","matchCriteriaId":"AB8FA716-DCCF-4E1B-B683-B5313303ED3E"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","matchCriteriaId":"07B237A9-69A3-4A9C-9DA0-4E06BD37AE73"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*","matchCriteriaId":"E460AA51-FCDA-46B9-AE97-E6676AA5E194"},{"vulnerable":true,"criteria":"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*","matchCriteriaId":"A930E247-0B43-43CB-98FF-6CE7B8189835"}]}]}],"references":[{"url":"https://github.com/flatpak/flatpak/commit/8279c5818425b6812523e3805bbe242fb6a5d961","source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/flatpak/flatpak/commit/a7401e638bf0c03102039e216ab1081922f140ae","source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/flatpak/flatpak/commit/eb7946bb6248923d8c90fe9b84425fef97ae580d","source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/flatpak/flatpak/pull/4156","source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/flatpak/flatpak/releases/tag/1.10.2","source":"security-advisories@github.com","tags":["Release Notes","Third Party Advisory"]},{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-xgh4-387p-hqpp","source":"security-advisories@github.com","tags":["Third Party Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2MXXLXC2DPJ45HSMTI5MZYHMYEGQN6AA/","source":"security-advisories@github.com"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WXNVFOIB6ZP4DGOVKAM25T6OIEP3YLGV/","source":"security-advisories@github.com"},{"url":"https://security.gentoo.org/glsa/202312-12","source":"security-advisories@github.com"},{"url":"https://www.debian.org/security/2021/dsa-4868","source":"security-advisories@github.com","tags":["Third Party Advisory"]},{"url":"https://github.com/flatpak/flatpak/commit/8279c5818425b6812523e3805bbe242fb6a5d961","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/flatpak/flatpak/commit/a7401e638bf0c03102039e216ab1081922f140ae","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/flatpak/flatpak/commit/eb7946bb6248923d8c90fe9b84425fef97ae580d","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/flatpak/flatpak/pull/4156","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"]},{"url":"https://github.com/flatpak/flatpak/releases/tag/1.10.2","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Third Party Advisory"]},{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-xgh4-387p-hqpp","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2MXXLXC2DPJ45HSMTI5MZYHMYEGQN6AA/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WXNVFOIB6ZP4DGOVKAM25T6OIEP3YLGV/","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202312-12","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.debian.org/security/2021/dsa-4868","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"]}]}}]}