GSD-2020-11934

Vulnerability from gsd - Updated: 2023-12-13 01:22
Details
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.
Aliases
Aliases
CVE-2020-11934
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{
  "GSD": {
    "alias": "CVE-2020-11934",
    "description": "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.",
    "id": "GSD-2020-11934",
    "references": [
      "https://ubuntu.com/security/CVE-2020-11934"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2020-11934"
      ],
      "details": "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.",
      "id": "GSD-2020-11934",
      "modified": "2023-12-13T01:22:07.996718Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
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      "CVE_data_meta": {
        "AKA": "",
        "ASSIGNER": "security@ubuntu.com",
        "DATE_PUBLIC": "2020-05-22T05:55:00.000Z",
        "ID": "CVE-2020-11934",
        "STATE": "PUBLIC",
        "TITLE": "Sandbox escape vulnerability via snapctl user-open (xdg-open)"
      },
      "affects": {
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          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "snapd",
                    "version": {
                      "version_data": [
                        {
                          "platform": "",
                          "version_affected": "\u003c",
                          "version_name": "2.45.1",
                          "version_value": "2.45.1ubuntu0.2"
                        },
                        {
                          "platform": "",
                          "version_affected": "\u003c",
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                          "platform": "",
                          "version_affected": "\u003c",
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                        }
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                    }
                  }
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              },
              "vendor_name": "Canonical"
            }
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        }
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      "configuration": [],
      "credit": [
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          "lang": "eng",
          "value": "James Henstridge"
        }
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      "data_type": "CVE",
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      "description": {
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            "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."
          }
        ]
      },
      "exploit": [],
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "impact": {
        "cvss": {
          "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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                "value": "Sandbox escape vulnerability"
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            "name": "https://ubuntu.com/USN-4424-1",
            "refsource": "CONFIRM",
            "url": "https://ubuntu.com/USN-4424-1"
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            "url": "https://launchpad.net/bugs/1880085"
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      "solution": [],
      "source": {
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        "defect": [
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        "discovery": "INTERNAL"
      },
      "work_around": []
    },
    "nvd.nist.gov": {
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        "description": {
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              "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."
            }
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        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "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,
          "severity": "LOW",
          "userInteractionRequired": true
        },
        "baseMetricV3": {
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            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
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            "confidentialityImpact": "NONE",
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            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "REQUIRED",
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          "exploitabilityScore": 1.5,
          "impactScore": 4.0
        }
      },
      "lastModifiedDate": "2020-08-05T18:46Z",
      "publishedDate": "2020-07-29T17:15Z"
    }
  }
}



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