This whitepaper provides an overview of a Polkit authentication bypass vulnerability that allows for local privilege escalation.
You can download it from the following link: https://packetstormsecurity.com/files/download/165088/Polkit_CVE-2021-3560.pdf
Source: https://packetstormsecurity.com/files/165088/Polkit-Authentication-Bypass-Local-Privilege-Escalation.html