ubuntu-cve-2021-3155
Vulnerability from osv_ubuntu
Published
2021-01-13 00:00
Modified
2025-10-15 16:50
Summary
Details

snapd 2.54.2 and earlier created ~/snap directories in user home directories without specifying owner-only permissions. This could allow a local attacker to read information that should have been private. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.8 (Low)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.54.3+16.04~esm2"
          },
          {
            "binary_name": "golang-github-ubuntu-core-snappy-dev",
            "binary_version": "2.54.3+16.04~esm2"
          },
          {
            "binary_name": "snap-confine",
            "binary_version": "2.54.3+16.04~esm2"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.54.3+16.04~esm2"
          },
          {
            "binary_name": "snapd-xdg-open",
            "binary_version": "2.54.3+16.04~esm2"
          },
          {
            "binary_name": "ubuntu-core-launcher",
            "binary_version": "2.54.3+16.04~esm2"
          },
          {
            "binary_name": "ubuntu-core-snapd-units",
            "binary_version": "2.54.3+16.04~esm2"
          },
          {
            "binary_name": "ubuntu-snappy",
            "binary_version": "2.54.3+16.04~esm2"
          },
          {
            "binary_name": "ubuntu-snappy-cli",
            "binary_version": "2.54.3+16.04~esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.54.3+16.04~esm2?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.54.3+16.04~esm2"
            }
          ],
          "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",
        "2.45.1ubuntu0.2",
        "2.46.1",
        "2.47.1",
        "2.48",
        "2.48.3"
      ]
    },
    {
      "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"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "golang-github-snapcore-snapd-dev",
            "binary_version": "2.54.3+20.04.1"
          },
          {
            "binary_name": "golang-github-ubuntu-core-snappy-dev",
            "binary_version": "2.54.3+20.04.1"
          },
          {
            "binary_name": "snap-confine",
            "binary_version": "2.54.3+20.04.1"
          },
          {
            "binary_name": "snapd",
            "binary_version": "2.54.3+20.04.1"
          },
          {
            "binary_name": "snapd-xdg-open",
            "binary_version": "2.54.3+20.04.1"
          },
          {
            "binary_name": "ubuntu-core-launcher",
            "binary_version": "2.54.3+20.04.1"
          },
          {
            "binary_name": "ubuntu-core-snapd-units",
            "binary_version": "2.54.3+20.04.1"
          },
          {
            "binary_name": "ubuntu-snappy",
            "binary_version": "2.54.3+20.04.1"
          },
          {
            "binary_name": "ubuntu-snappy-cli",
            "binary_version": "2.54.3+20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "snapd",
        "purl": "pkg:deb/ubuntu/snapd@2.54.3+20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.54.3+20.04.1"
            }
          ],
          "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",
        "2.54.3+20.04"
      ]
    }
  ],
  "aliases": [],
  "details": "snapd 2.54.2 and earlier created ~/snap directories in user home directories without specifying owner-only permissions. This could allow a local attacker to read information that should have been private. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1",
  "id": "UBUNTU-CVE-2021-3155",
  "modified": "2025-10-15T16:50:09Z",
  "published": "2021-01-13T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-3155"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5292-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-3155"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5292-3"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5292-2"
    }
  ],
  "related": [
    "USN-5292-1",
    "USN-5292-3",
    "USN-5292-2"
  ],
  "schema_version": "1.7.0",
  "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"
    }
  ],
  "upstream": [
    "CVE-2021-3155"
  ]
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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