[USN-3892-1] GDM vulnerability

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Ubuntu Security Notice USN-3892-1
February 20, 2019

gdm3 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

– Ubuntu 18.10
– Ubuntu 18.04 LTS

Summary:

GDM could give unauthorized access to a different user.

Software Description:
– gdm3: GNOME Display Manager

Details:

Burghard Britzke discovered that GDM incorrectly handled certain
configurations. An attacker could possibly use this issue to get
unauthorized access to a different user.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.10:
=C2=A0 gdm3=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A03.30.1-1ubuntu5.1

Ubuntu 18.04 LTS:
=C2=A0 gdm3=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A03.28.3-0ubuntu18.04.4

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
=C2=A0 https://usn.ubuntu.com/usn/usn-3892-1
=C2=A0 CVE-2019-3825

Package Information:
=C2=A0 https://launchpad.net/ubuntu/+source/gdm3/3.30.1-1ubuntu5.1
=C2=A0 https://launchpad.net/ubuntu/+source/gdm3/3.28.3-0ubuntu18.04.4
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