[ GLSA 202008-23 ] chrony: Symlink vulnerability

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Gentoo Linux Security Advisory                           GLSA 202008-23
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: chrony: Symlink vulnerability
     Date: August 30, 2020
     Bugs: #738154
       ID: 202008-23

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Synopsis
========

A vulnerability in chrony may allow a privileged attacker to cause data
loss via a symlink.

Background
==========

chrony is a versatile implementation of the Network Time Protocol
(NTP).

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-misc/chrony              < 3.5.1                    >= 3.5.1

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

It was found that chrony did not check whether its PID file was a
symlink.

Impact
======

A local attacker could perform symlink attack(s) to overwrite arbitrary
files with root privileges.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All chrony users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-misc/chrony-3.5.1"

References
==========

[ 1 ] CVE-2020-14367
      https://nvd.nist.gov/vuln/detail/CVE-2020-14367
[ 2 ] chrony-3.5.1 release announcement
      https://listengine.tuxfamily.org/chrony.tuxfamily.org/chrony-announce/2020/08/msg00000.html

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

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

 https://security.gentoo.org/glsa/202008-23

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 2020 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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