[USN-4614-1] GDM vulnerability

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[USN-4614-1] GDM vulnerability

Marc Deslauriers-3
Ubuntu Security Notice USN-4614-1
November 03, 2020

gdm3 vulnerability

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

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS


GDM could be made to create privileged users.

Software Description:
- gdm3: GNOME Display Manager


Kevin Backhouse discovered that GDM incorrectly launched the initial setup
tool when the accountsservice daemon was not reachable. A local attacker
able to cause accountsservice to crash or stop responding could trick GDM
into launching the initial setup tool and create a privileged user.

Update instructions:

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

Ubuntu 20.10:
  gdm3                            3.38.1-2ubuntu1.1

Ubuntu 20.04 LTS:
  gdm3                            3.36.3-0ubuntu0.20.04.2

Ubuntu 18.04 LTS:
  gdm3                            3.28.3-0ubuntu18.04.6

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


Package Information:

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