[ GLSA 202201-01 ] Polkit: Local privilege escalation

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Gentoo Linux Security Advisory                           GLSA 202201-01
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                                           https://security.gentoo.org/
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 Severity: High
    Title: Polkit: Local privilege escalation
     Date: January 27, 2022
     Bugs: #832057
       ID: 202201-01

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Synopsis
========

A vulnerability in polkit could lead to local root privilege escalation.

Background
==========

polkit is a toolkit for managing policies related to unprivileged
processes communicating with privileged process.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  sys-auth/polkit            < 0.120-r2                >= 0.120-r2

Description
===========

Flawed input validation of arguments was discovered in the 'pkexec'
program's main() function.

Impact
======

A local attacker could achieve root privilege escalation.

Workaround
==========

Run the following command as root:
# chmod 0755 /usr/bin/pkexec

Resolution
==========

Upgrade Polkit to a patched version.

  emerge --ask --verbose ">=sys-auth/polkit-0.120-r2"

References
==========

[ 1 ] CVE-2021-4034
      https://nvd.nist.gov/vuln/detail/CVE-2021-4034

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/202201-01

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
[email protected] or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2022 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5

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