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USN-5292-1 (UBUNTU-CVE-2021-3155)

Vulnerability from osv_ubuntu – Published: 2022-02-17 17:24 – Updated: 2026-02-10 04:42 – Source website
VLAI
Summary
snapd vulnerabilities
Details

James Troup discovered that snap did not properly manage the permissions for the snap directories. A local attacker could possibly use this issue to expose sensitive information. (CVE-2021-3155)

Ian Johnson discovered that snapd did not properly validate content interfaces and layout paths. A local attacker could possibly use this issue to inject arbitrary AppArmor policy rules, resulting in a bypass of intended access restrictions. (CVE-2021-4120)

The Qualys Research Team discovered that snapd did not properly validate the location of the snap-confine binary. A local attacker could possibly use this issue to execute other arbitrary binaries and escalate privileges. (CVE-2021-44730)

The Qualys Research Team discovered that a race condition existed in the snapd snap-confine binary when preparing a private mount namespace for a snap. A local attacker could possibly use this issue to escalate privileges and execute arbitrary code. (CVE-2021-44731)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-3155",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-4120",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-44730",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2021-44731",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "high",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.54.3+18.04"
          },
          {
            "binary_name": "golang-github-ubuntu-core-snappy-dev",
            "binary_version": "2.54.3+18.04"
          },
          {
            "binary_name": "snap-confine",
            "binary_version": "2.54.3+18.04"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.54.3+18.04"
          },
          {
            "binary_name": "snapd-xdg-open",
            "binary_version": "2.54.3+18.04"
          },
          {
            "binary_name": "ubuntu-core-launcher",
            "binary_version": "2.54.3+18.04"
          },
          {
            "binary_name": "ubuntu-core-snapd-units",
            "binary_version": "2.54.3+18.04"
          },
          {
            "binary_name": "ubuntu-snappy",
            "binary_version": "2.54.3+18.04"
          },
          {
            "binary_name": "ubuntu-snappy-cli",
            "binary_version": "2.54.3+18.04"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.54.3+18.04?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.54.3+18.04"
            }
          ],
          "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",
        "2.45.1+18.04.2",
        "2.46.1+18.04",
        "2.47.1+18.04",
        "2.48+18.04",
        "2.48.3+18.04",
        "2.49.2+18.04",
        "2.51.1+18.04",
        "2.54.2+18.04ubuntu1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [],
          "ecosystem": "Ubuntu:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.54.3+20.04"
          },
          {
            "binary_name": "golang-github-ubuntu-core-snappy-dev",
            "binary_version": "2.54.3+20.04"
          },
          {
            "binary_name": "snap-confine",
            "binary_version": "2.54.3+20.04"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.54.3+20.04"
          },
          {
            "binary_name": "snapd-xdg-open",
            "binary_version": "2.54.3+20.04"
          },
          {
            "binary_name": "ubuntu-core-launcher",
            "binary_version": "2.54.3+20.04"
          },
          {
            "binary_name": "ubuntu-core-snapd-units",
            "binary_version": "2.54.3+20.04"
          },
          {
            "binary_name": "ubuntu-snappy",
            "binary_version": "2.54.3+20.04"
          },
          {
            "binary_name": "ubuntu-snappy-cli",
            "binary_version": "2.54.3+20.04"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.54.3+20.04?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.54.3+20.04"
            }
          ],
          "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",
        "2.45.1+20.04.2",
        "2.46.1+20.04",
        "2.47.1+20.04",
        "2.48+20.04",
        "2.48.3+20.04",
        "2.49.2+20.04",
        "2.51.1+20.04ubuntu2",
        "2.54.2+20.04ubuntu2"
      ]
    }
  ],
  "aliases": [],
  "details": "James Troup discovered that snap did not properly manage the permissions for\nthe snap directories. A local attacker could possibly use this issue to expose\nsensitive information. (CVE-2021-3155)\n\nIan Johnson discovered that snapd did not properly validate content interfaces\nand layout paths. A local attacker could possibly use this issue to inject\narbitrary AppArmor policy rules, resulting in a bypass of intended access\nrestrictions. (CVE-2021-4120)\n\nThe Qualys Research Team discovered that snapd did not properly validate the\nlocation of the snap-confine binary. A local attacker could possibly use this\nissue to execute other arbitrary binaries and escalate privileges.\n(CVE-2021-44730)\n\nThe Qualys Research Team discovered that a race condition existed in the snapd\nsnap-confine binary when preparing a private mount namespace for a snap. A\nlocal attacker could possibly use this issue to escalate privileges and\nexecute arbitrary code. (CVE-2021-44731)\n",
  "id": "USN-5292-1",
  "modified": "2026-02-10T04:42:29Z",
  "published": "2022-02-17T17:24:49Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5292-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3155"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-4120"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-44730"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-44731"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "snapd vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2021-3155",
    "UBUNTU-CVE-2021-4120",
    "UBUNTU-CVE-2021-44730",
    "UBUNTU-CVE-2021-44731"
  ]
}



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