USN-4424-1

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Source
https://ubuntu.com/security/notices/USN-4424-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4424-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-4424-1
Upstream
  • UBUNTU-CVE-2020-11933
Related
Published
2020-07-15T14:49:53.647723Z
Modified
2025-10-13T04:35:10Z
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 XDGDATADIRS 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

Affected packages

Ubuntu:16.04:LTS / snapd

Package

Name
snapd
Purl
pkg:deb/ubuntu/snapd@2.45.1ubuntu0.2?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.45.1ubuntu0.2

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

Ecosystem specific 

{
    "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"
        }
    ],
    "availability": "No subscription required"
}

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"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4424-1.json"

Ubuntu:18.04:LTS / snapd

Package

Name
snapd
Purl
pkg:deb/ubuntu/snapd@2.45.1+18.04.2?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.45.1+18.04.2

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

Ecosystem specific 

{
    "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"
        }
    ],
    "availability": "No subscription required"
}

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"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4424-1.json"

Ubuntu:20.04:LTS / snapd

Package

Name
snapd
Purl
pkg:deb/ubuntu/snapd@2.45.1+20.04.2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.45.1+20.04.2

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

Ecosystem specific 

{
    "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"
        }
    ],
    "availability": "No subscription required"
}

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"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4424-1.json"