GNOME Shell could be made to execute keyboard shortcuts and other actions while the workstation was locked.
It was discovered that the GNOME Shell incorrectly handled certain keyboard inputs. An attacker could possibly use this issue to invoke keyboard shortcuts, and potentially other actions while the workstation was locked.
6 May 2019
A security issue affects these releases of Ubuntu and its derivatives:
GNOME Shell could be made to execute keyboard shortcuts and other actions while the workstation was locked.
It was discovered that the GNOME Shell incorrectly handled certain keyboard inputs. An attacker could possibly use this issue to invoke keyboard shortcuts, and potentially other actions while the workstation was locked.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make all the necessary changes.
Vulmon