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Ubuntu 20.04 LTS USN-4614-1 Moderate: GDM Privileged User Issue

ubuntu
Calendar Grey November 3, 2020
Dist Ubuntu Esm H88
A vulnerability in GDM enables the formation of elevated user accounts on Ubuntu 20.10, 20.04 LTS, and 18.04 LTS systems.
GDM could be made to create privileged users.

Summary

GDM could be made to create privileged users.

Software Description:

- gdm3: GNOME Display Manager

Details:

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.

Topics%20covered

Topics Covered

security advisory local attack ubuntu gdm3 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.

References

https://ubuntu.com/security/notices/USN-4614-1

CVE-2020-16125

Severity
important
Lowest
Low
Medium
High
Critical

November 03, 2020

Topics%20covered

Topics Covered

security advisory local attack ubuntu gdm3 privileged user

Package Information

https://launchpad.net/ubuntu/+source/gdm3/3.38.1-2ubuntu1.1
https://launchpad.net/ubuntu/+source/gdm3/3.36.3-0ubuntu0.20.04.2
https://launchpad.net/ubuntu/+source/gdm3/3.28.3-0ubuntu18.04.6

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