fkie_cve-2020-11934
Vulnerability from fkie_nvd
Published
2020-07-29 17:15
Modified
2024-11-21 04:58
Severity ?
5.9 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
5.9 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
Summary
It was discovered that snapctl user-open allowed altering the $XDG_DATA_DIRS environment variable when calling the system xdg-open. OpenURL() in usersession/userd/launcher.go would alter $XDG_DATA_DIRS to append a path to a directory controlled by the calling snap. A malicious snap could exploit this to bypass intended access restrictions to control how the host system xdg-open script opens the URL and, for example, execute a script shipped with the snap without confinement. This issue did not affect Ubuntu Core systems. Fixed in snapd versions 2.45.1ubuntu0.2, 2.45.1+18.04.2 and 2.45.1+20.04.2.
References
security@ubuntu.comhttps://launchpad.net/bugs/1880085Third Party Advisory
security@ubuntu.comhttps://ubuntu.com/USN-4424-1Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://launchpad.net/bugs/1880085Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://ubuntu.com/USN-4424-1Vendor Advisory
Impacted products
Vendor Product Version
canonical ubuntu_linux 16.04
canonical ubuntu_linux 18.04
canonical ubuntu_linux 19.10
canonical ubuntu_linux 20.04


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "matchCriteriaId": "F7016A2A-8365-4F1A-89A2-7A19F2BCAE5B",
              "vulnerable": true
            },
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              "matchCriteriaId": "23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D",
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "It was discovered that snapctl user-open allowed altering the $XDG_DATA_DIRS environment variable when calling the system xdg-open. OpenURL() in usersession/userd/launcher.go would alter $XDG_DATA_DIRS to append a path to a directory controlled by the calling snap. A malicious snap could exploit this to bypass intended access restrictions to control how the host system xdg-open script opens the URL and, for example, execute a script shipped with the snap without confinement. This issue did not affect Ubuntu Core systems. Fixed in snapd versions 2.45.1ubuntu0.2, 2.45.1+18.04.2 and 2.45.1+20.04.2."
    },
    {
      "lang": "es",
      "value": "Se detect\u00f3 que snapctl user-open permit\u00eda alterar la variable de entorno $XDG_DATA_DIRS cuando se llama al sistema xdg-open. La funci\u00f3n OpenURL() en el archivo usersession/userd/launcher.go alterar\u00eda $XDG_DATA_DIRS para agregar una ruta a un directorio controlado por el complemento de llamada. Un complemento malicioso podr\u00eda explotar esto para omitir las restricciones de acceso previstas para controlar c\u00f3mo el script xdg-open del sistema host abre la URL y, por ejemplo, ejecuta un script enviado con el complemento sin confinamiento. Este problema no afect\u00f3 a los sistemas Ubuntu Core. Corregido en las versiones snapd 2.45.1ubuntu0.2, 2.45.1+18.04.2 y 2.45.1+20.04.2"
    }
  ],
  "id": "CVE-2020-11934",
  "lastModified": "2024-11-21T04:58:56.127",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "LOW",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 1.9,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:L/AC:M/Au:N/C:N/I:P/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 3.4,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
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    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
          "version": "3.1"
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        "exploitabilityScore": 1.5,
        "impactScore": 4.0,
        "source": "security@ubuntu.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.5,
        "impactScore": 4.0,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  },
  "published": "2020-07-29T17:15:12.967",
  "references": [
    {
      "source": "security@ubuntu.com",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://launchpad.net/bugs/1880085"
    },
    {
      "source": "security@ubuntu.com",
      "tags": [
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      "url": "https://ubuntu.com/USN-4424-1"
    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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  ],
  "sourceIdentifier": "security@ubuntu.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-668"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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