A GNOME Shell security update has been released for Ubuntu Linux 23.04.

[USN-6395-1] GNOME Shell vulnerability

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Ubuntu Security Notice USN-6395-1
September 21, 2023

gnome-shell vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04

Summary:

GNOME Shell could be made to expose sensitive information.

Software Description:
- gnome-shell: graphical shell for the GNOME desktop

Details:

Mickael Karatekin discovered that GNOME Shell incorrectly allowed the
screenshot tool to view open windows when a session was locked. A local
attacker could possibly use this issue to obtain sensitive information.

Update instructions:

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

Ubuntu 23.04:
gnome-shell 44.3-0ubuntu1.1

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

References:
https://ubuntu.com/security/notices/USN-6395-1
CVE-2023-43090

Package Information:
https://launchpad.net/ubuntu/+source/gnome-shell/44.3-0ubuntu1.1