UBUNTU-CVE-2020-11934

Source
https://ubuntu.com/security/CVE-2020-11934
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-11934.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-11934
Related
Published
2020-07-15T12:00:00Z
Modified
2025-01-13T10:22:11Z
Severity
  • 7.6 (High) CVSS_V3 - CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N CVSS Calculator
Summary
[none]
Details

It was discovered that snapctl user-open allowed altering the $XDGDATADIRS environment variable when calling the system xdg-open. OpenURL() in usersession/userd/launcher.go would alter $XDGDATADIRS to append a path to a directory controlled by the calling snap. A malicious snap could exploit this to bypass intended access restrictions to control how the host system xdg-open script opens the URL and, for example, execute a script shipped with the snap without confinement. This issue did not affect Ubuntu Core systems. Fixed in snapd versions 2.45.1ubuntu0.2, 2.45.1+18.04.2 and 2.45.1+20.04.2.

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

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "2.45.1ubuntu0.2",
            "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-dbgsym"
        },
        {
            "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"
        }
    ]
}

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

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "2.45.1+18.04.2",
            "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-dbgsym"
        },
        {
            "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"
        }
    ]
}

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

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "2.45.1+20.04.2",
            "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-dbgsym"
        },
        {
            "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"
        }
    ]
}