CVE-2021-4034

HIGH7.8

CISA KEV

Published 2022-01-28 · Updated 2026-08-15 · Source secalert@redhat.com

Description

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.

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-787CWE-125CWE-787

CISA Known-Exploited Vulnerability

Product: Red Hat — Polkit

Name: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability

Date added: 2022-06-27 · Due: 2022-07-18

USED IN RANSOMWARE

Required action: Apply updates per vendor instructions.

References

View on NVD

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