A Zsh security update is available for Gentoo Linux to address a vulnerability that might allow an attacker to escalate privileges.

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Gentoo Linux Security Advisory GLSA 202003-55
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  https://security.gentoo.org/
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Severity: Normal
Title: Zsh: Privilege escalation
Date: March 25, 2020
Bugs: #711136
ID: 202003-55

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Synopsis
========

A vulnerability in Zsh might allow an attacker to escalate privileges.

Background
==========

A shell designed for interactive use, although it is also a powerful
scripting language.

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

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Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-shells/zsh < 5.8 >= 5.8

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

It was discovered that Zsh was insecure dropping privileges when
unsetting PRIVILEGED option.

Impact
======

An attacker could escalate privileges.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Zsh users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-shells/zsh-5.8"

References
==========

[ 1 ] CVE-2019-20044
  https://nvd.nist.gov/vuln/detail/CVE-2019-20044

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

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

  https://security.gentoo.org/glsa/202003-55

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 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