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[gentoo-announce] [ GLSA 202407-01 ] Zsh: Prompt Expansion Vulnerability

Posted on 01 July 2024
Gentoo-announce

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Gentoo Linux Security Advisory GLSA 202407-01
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https://security.gentoo.org/
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Severity: Normal
Title: Zsh: Prompt Expansion Vulnerability
Date: July 01, 2024
Bugs: #833252
ID: 202407-01

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Synopsis
========
A vulnerability has been discovered in Zsh, which can lead to execution
of arbitrary code.

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

Affected packages
=================
Package Vulnerable Unaffected
-------------- ------------ ------------
app-shells/zsh < 5.8.1 >= 5.8.1

Description
===========
Multiple vulnerabilities have been discovered in Zsh. Please review the
CVE identifiers referenced below for details.

Impact
======
A vulnerability in prompt expansion could be exploited through e.g.
VCS_Info to execute arbitrary shell commands without a user's knowledge.

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-5.8.1"

References
==========
[ 1 ] CVE-2021-45444
https://nvd.nist.gov/vuln/detail/CVE-2021-45444

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

https://security.gentoo.org/glsa/202407-01

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 2024 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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