usn-4424-1
Vulnerability from osv_ubuntu
Published
2020-07-15 14:49
Modified
2026-02-10 04:41
Summary
snapd vulnerabilities
Details

It was discovered that cloud-init as managed by snapd on Ubuntu Core 16 and Ubuntu Core 18 devices ran on every boot without restrictions. A physical attacker could exploit this to craft cloud-init user-data/meta-data via external media to perform arbitrary changes on the device to bypass intended security mechanisms such as full disk encryption. This issue did not affect traditional Ubuntu systems. (CVE-2020-11933)

It was discovered that snapctl user-open allowed altering the XDG_DATA_DIRS environment variable when calling the system xdg-open. A malicious snap could exploit this to bypass intended access restrictions to control how the host system xdg-open script opens the URL. This issue did not affect Ubuntu Core systems. (CVE-2020-11934)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-11934",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.45.1ubuntu0.2"
          },
          {
            "binary_name": "golang-github-ubuntu-core-snappy-dev",
            "binary_version": "2.45.1ubuntu0.2"
          },
          {
            "binary_name": "snap-confine",
            "binary_version": "2.45.1ubuntu0.2"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.45.1ubuntu0.2"
          },
          {
            "binary_name": "snapd-xdg-open",
            "binary_version": "2.45.1ubuntu0.2"
          },
          {
            "binary_name": "ubuntu-core-launcher",
            "binary_version": "2.45.1ubuntu0.2"
          },
          {
            "binary_name": "ubuntu-core-snapd-units",
            "binary_version": "2.45.1ubuntu0.2"
          },
          {
            "binary_name": "ubuntu-snappy",
            "binary_version": "2.45.1ubuntu0.2"
          },
          {
            "binary_name": "ubuntu-snappy-cli",
            "binary_version": "2.45.1ubuntu0.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.45.1ubuntu0.2?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.45.1ubuntu0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9",
        "1.9.1.1",
        "1.9.2",
        "2.0",
        "2.0.1",
        "2.0.2",
        "2.0.3",
        "2.0.5",
        "2.0.8",
        "2.0.9",
        "2.0.10",
        "2.11+0.16.04",
        "2.12+0.16.04",
        "2.13",
        "2.14.2~16.04",
        "2.15.2ubuntu1",
        "2.16ubuntu3",
        "2.17.1ubuntu1",
        "2.20.1ubuntu1",
        "2.21",
        "2.22.2",
        "2.22.3",
        "2.22.6",
        "2.23.1",
        "2.24.1",
        "2.25",
        "2.26.10",
        "2.27.5",
        "2.28.5",
        "2.29.4.2",
        "2.32.3.2",
        "2.32.9",
        "2.33.1ubuntu2",
        "2.34.2",
        "2.34.2ubuntu0.1",
        "2.37.4",
        "2.37.4ubuntu0.1",
        "2.38",
        "2.39.2",
        "2.39.2ubuntu0.2",
        "2.40",
        "2.42.1",
        "2.45.1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-11934",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.45.1+18.04.2"
          },
          {
            "binary_name": "golang-github-ubuntu-core-snappy-dev",
            "binary_version": "2.45.1+18.04.2"
          },
          {
            "binary_name": "snap-confine",
            "binary_version": "2.45.1+18.04.2"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.45.1+18.04.2"
          },
          {
            "binary_name": "snapd-xdg-open",
            "binary_version": "2.45.1+18.04.2"
          },
          {
            "binary_name": "ubuntu-core-launcher",
            "binary_version": "2.45.1+18.04.2"
          },
          {
            "binary_name": "ubuntu-core-snapd-units",
            "binary_version": "2.45.1+18.04.2"
          },
          {
            "binary_name": "ubuntu-snappy",
            "binary_version": "2.45.1+18.04.2"
          },
          {
            "binary_name": "ubuntu-snappy-cli",
            "binary_version": "2.45.1+18.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.45.1+18.04.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.45.1+18.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.28.5+17.10",
        "2.29.4.1+18.04",
        "2.29.4.2+18.04",
        "2.31.1+18.04",
        "2.32+18.04~pre5",
        "2.32+18.04~pre6",
        "2.32+18.04",
        "2.32.3.2+18.04",
        "2.32.5+18.04",
        "2.32.8+18.04",
        "2.32.9+18.04",
        "2.33.1+18.04ubuntu2",
        "2.34.2+18.04",
        "2.34.2+18.04.1",
        "2.37.1+18.04",
        "2.37.1.1+18.04",
        "2.37.4+18.04",
        "2.37.4+18.04.1",
        "2.38+18.04",
        "2.39.2+18.04",
        "2.40+18.04",
        "2.42.1+18.04",
        "2.45.1+18.04"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2020-11934",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.45.1+20.04.2"
          },
          {
            "binary_name": "golang-github-ubuntu-core-snappy-dev",
            "binary_version": "2.45.1+20.04.2"
          },
          {
            "binary_name": "snap-confine",
            "binary_version": "2.45.1+20.04.2"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.45.1+20.04.2"
          },
          {
            "binary_name": "snapd-xdg-open",
            "binary_version": "2.45.1+20.04.2"
          },
          {
            "binary_name": "ubuntu-core-launcher",
            "binary_version": "2.45.1+20.04.2"
          },
          {
            "binary_name": "ubuntu-core-snapd-units",
            "binary_version": "2.45.1+20.04.2"
          },
          {
            "binary_name": "ubuntu-snappy",
            "binary_version": "2.45.1+20.04.2"
          },
          {
            "binary_name": "ubuntu-snappy-cli",
            "binary_version": "2.45.1+20.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.45.1+20.04.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.45.1+20.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.41+19.10.1",
        "2.42.1+20.04",
        "2.43.3+git1.8109f8",
        "2.44~pre1+20.04",
        "2.44+20.04",
        "2.44.2+20.04",
        "2.44.3+20.04",
        "2.45.1+20.04"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that cloud-init as managed by snapd on Ubuntu Core 16 and\nUbuntu Core 18 devices ran on every boot without restrictions. A physical\nattacker could exploit this to craft cloud-init user-data/meta-data via\nexternal media to perform arbitrary changes on the device to bypass\nintended security mechanisms such as full disk encryption. This issue did\nnot affect traditional Ubuntu systems. (CVE-2020-11933)\n\nIt was discovered that snapctl user-open allowed altering the XDG_DATA_DIRS \nenvironment variable when calling the system xdg-open. A malicious snap \ncould exploit this to bypass intended access restrictions to control how\nthe host system xdg-open script opens the URL. This issue did not affect \nUbuntu Core systems. (CVE-2020-11934)\n",
  "id": "USN-4424-1",
  "modified": "2026-02-10T04:41:52Z",
  "published": "2020-07-15T14:49:53Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4424-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-11933"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-11934"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "snapd vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2020-11933",
    "UBUNTU-CVE-2020-11934"
  ]
}



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