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CVE-2021-4034

Published: 25 January 2022

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.

Priority

High

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
policykit-1
Launchpad, Ubuntu, Debian
bionic
Released (0.105-20ubuntu0.18.04.6)
focal
Released (0.105-26ubuntu1.2)
hirsute Ignored
(end of life)
impish
Released (0.105-31ubuntu0.1)
upstream Needs triage

jammy
Released (0.105-31ubuntu1)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H