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[gentoo-announce] [ GLSA 202201-01 ] Polkit: Local privilege escalation

Posted on 27 January 2022
Gentoo-announce

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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
security@gentoo.org 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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