Kevin Backhouse walks through a vulnerability in polkit, a widely used system service, here in Ubuntu 20.04, but also used in other distributions such as Fedora and RHEL 8. Using a combination of dbus-send, sleep, and kill, Kevin gets a root shell.
For an in-depth discussion of this vulnerability:
.
Concluzion: Linux local privilege escalation using authentication bypass vulnerability in polkit CVE-2021-3560 – software vulnerability,linux,policykit,devops,polkit,change polkit,polkit vulnerability,how to polkit,how to change polkit