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CVE-2022-21682

Estado: ModificadaMedia (6.5)—

Flatpak is a Linux application sandboxing and distribution framework. A path traversal vulnerability affects versions of Flatpak prior to 1.12.3 and 1.10.6. flatpak-builder applies `finish-args` last in the build. At this point the build directory will have the full access that is specified in the manifest, so running `flatpak build` against it will gain those permissions. Normally this will not be done, so this is not problem.

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However, if `--mirror-screenshots-url` is specified, then flatpak-builder will launch `flatpak build --nofilesystem=host appstream-utils mirror-screenshots` after finalization, which can lead to issues even with the `--nofilesystem=host` protection. In normal use, the only issue is that these empty directories can be created wherever the user has write permissions. However, a malicious application could replace the `appstream-util` binary and potentially do something more hostile. This has been resolved in Flatpak 1.12.3 and 1.10.6 by changing the behaviour of `--nofilesystem=home` and `--nofilesystem=host`.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (5)

Debian — Debian LinuxFedoraproject — FedoraFlatpak — FlatpakFlatpak — Flatpak-builderRedhat — Enterprise Linux

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-21682",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
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        "acInsufInfo": false,
        "impactScore": 2.9,
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        "obtainAllPrivilege": false,
        "exploitabilityScore": 8,
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        "obtainOtherPrivilege": false,
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N",
          "integrityImpact": "HIGH",
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          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
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  "published": "2022-01-13T21:15:08.690",
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  "vulnStatus": "Modified",
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      "description": [
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Flatpak is a Linux application sandboxing and distribution framework. A path traversal vulnerability affects versions of Flatpak prior to 1.12.3 and 1.10.6. flatpak-builder applies `finish-args` last in the build. At this point the build directory will have the full access that is specified in the manifest, so running `flatpak build` against it will gain those permissions. Normally this will not be done, so this is not problem. However, if `--mirror-screenshots-url` is specified, then flatpak-builder will launch `flatpak build --nofilesystem=host appstream-utils mirror-screenshots` after finalization, which can lead to issues even with the `--nofilesystem=host` protection. In normal use, the only issue is that these empty directories can be created wherever the user has write permissions. However, a malicious application could replace the `appstream-util` binary and potentially do something more hostile. This has been resolved in Flatpak 1.12.3 and 1.10.6 by changing the behaviour of `--nofilesystem=home` and `--nofilesystem=host`."
    },
    {
      "lang": "es",
      "value": "Flatpak es un marco de distribución y sandboxing de aplicaciones Linux. Una vulnerabilidad de salto de ruta afecta a las versiones de Flatpak anteriores a 1.12.3 y 1.10.6. flatpak-builder aplica \"finish-args\" en último lugar en la construcción. En este punto, el directorio de construcción tendrá el acceso completo que es especificado en el manifiesto, por lo que la ejecución de \"flatpak build\" contra él ganará esos permisos. Normalmente esto no se realiza, por lo que no es un problema. Sin embargo, si se especifica \"--mirror-screenshots-url\", entonces flatpak-builder lanzará \"flatpak build --nofilesystem=host appstream-utils mirror-screenshots\" tras la finalización, lo que puede conllevar a problemas incluso con la protección \"--nofilesystem=host\". En un uso normal, el único problema es que estos directorios vacíos pueden crearse en cualquier lugar donde el usuario tenga permisos de escritura. Sin embargo, una aplicación maliciosa podría reemplazar el binario \"appstream-util\" y potencialmente hacer algo más hostil. Esto ha sido resuelto en Flatpak versiones 1.12.3 y 1.10.6, al cambiar el comportamiento de \"--nofilesystem=home\" y \"--nofilesystem=host\""
    }
  ],
  "lastModified": "2026-06-17T04:26:45.213",
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