USN-3255-1

It was discovered that LightDM incorrectly handled home directory creation for guest users. A local attacker could use this issue to gain ownership of arbitrary directory paths and possibly gain administrative privileges.

References

Affected packages

Ubuntu:16.04:LTS / lightdm

Package

Name: lightdm
Purl: pkg:deb/ubuntu/lightdm@1.18.3-0ubuntu1.1?arch=source&distro=xenial

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.18.3-0ubuntu1.1

Affected versions

1.*

1.16.4-0ubuntu1

1.17.0-0ubuntu1

1.17.1-0ubuntu1

1.17.1-0ubuntu2

1.17.2-0ubuntu1

1.17.3-0ubuntu1

1.17.4-0ubuntu1

1.17.5-0ubuntu2

1.17.6-0ubuntu1

1.18.0-0ubuntu1

1.18.0-0ubuntu2

1.18.1-0ubuntu1

1.18.2-0ubuntu1

1.18.2-0ubuntu2

1.18.3-0ubuntu1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "gir1.2-lightdm-1"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "liblightdm-gobject-1-0"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "liblightdm-gobject-1-0-dbgsym"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "liblightdm-gobject-1-dev"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "liblightdm-gobject-1-doc"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "liblightdm-qt-3-0"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "liblightdm-qt-3-0-dbgsym"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "liblightdm-qt-dev"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "liblightdm-qt5-3-0"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "liblightdm-qt5-3-0-dbgsym"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "liblightdm-qt5-3-dev"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "lightdm"
        },
        {
            "binary_version": "1.18.3-0ubuntu1.1",
            "binary_name": "lightdm-dbgsym"
        }
    ]
}