CVE-2021-4034

A local privilege escalation vulnerability was found on polkit’s pkexec
utility. The pkexec application is a setuid tool designed to allow
unprivileged users to run commands as privileged users according predefined
policies. The current version of pkexec doesn’t handle the calling
parameters count correctly and ends trying to execute environment variables
as commands. An attacker can leverage this by crafting environment
variables in such a way it’ll induce pkexec to execute arbitrary code. When
successfully executed the attack can cause a local privilege escalation
given unprivileged users administrative rights on the target machine.