UBUNTU-CVE-2021-4120

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Source
https://ubuntu.com/security/CVE-2021-4120
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4120.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2021-4120
Upstream
Downstream
Related
Published
2022-02-17T17:00:00Z
Modified
2025-09-08T16:46:51Z
Severity
  • 8.2 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H CVSS Calculator
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

snapd 2.54.2 fails to perform sufficient validation of snap content interface and layout paths, resulting in the ability for snaps to inject arbitrary AppArmor policy rules via malformed content interface and layout declarations and hence escape strict snap confinement. Fixed in snapd versions 2.54.3+18.04, 2.54.3+20.04 and 2.54.3+21.10.1

References

Affected packages

Ubuntu:Pro:14.04:LTS / snapd

Package

Name
snapd
Purl
pkg:deb/ubuntu/snapd@2.54.3+14.04~esm1?arch=source&distro=trusty/esm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.54.3+14.04~esm1

Affected versions

2.*

2.21~14.04.2
2.22.2~14.04
2.22.3~14.04
2.22.6~14.04
2.23.1~14.04
2.24.1~14.04
2.25~14.04
2.26.10~14.04
2.27.5~14.04
2.28.5~14.04
2.29.4.2~14.04
2.32.3.2~14.04
2.32.9~14.04
2.33.1~14.04
2.34.2~14.04
2.34.2~14.04.1
2.37.4~14.04.1
2.38~14.04

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "golang-github-snapcore-snapd-dev"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "golang-github-ubuntu-core-snappy-dev"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "snap-confine"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "snapd"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "snapd-xdg-open"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "ubuntu-core-launcher"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "ubuntu-core-snapd-units"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "ubuntu-snappy"
        },
        {
            "binary_version": "2.54.3+14.04~esm1",
            "binary_name": "ubuntu-snappy-cli"
        }
    ]
}

Ubuntu:Pro:16.04:LTS / snapd

Package

Name
snapd
Purl
pkg:deb/ubuntu/snapd@2.54.3+16.04~esm2?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.54.3+16.04~esm2

Affected versions

1.*

1.9
1.9.1.1
1.9.2

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": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_version": "2.54.3+16.04~esm2",
            "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"
        }
    ]
}

Ubuntu:18.04:LTS / snapd

Package

Name
snapd
Purl
pkg:deb/ubuntu/snapd@2.54.3+18.04?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.54.3+18.04

Affected versions

2.*

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_version": "2.54.3+18.04",
            "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"
        }
    ]
}

Ubuntu:20.04:LTS / snapd

Package

Name
snapd
Purl
pkg:deb/ubuntu/snapd@2.54.3+20.04?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.54.3+20.04

Affected versions

2.*

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "2.54.3+20.04",
            "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"
        }
    ]
}