Home / mailings [gentoo-announce] [ GLSA 201903-02 ] Zsh: User-assisted execution of arbitrary code
Posted on 10 March 2019
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Gentoo Linux Security Advisory GLSA 201903-02
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https://security.gentoo.org/
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Severity: Normal
Title: Zsh: User-assisted execution of arbitrary code
Date: March 10, 2019
Bugs: #665278
ID: 201903-02
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Synopsis
========
Input validation errors in Zsh could result in arbitrary code
execution.
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 < 5.6 >= 5.6
Description
===========
Two input validation errors have been discovered in how Zsh parses
scripts:
* Parsing a malformed shebang line could cause Zsh to call a program
listed in the second line (CVE-2018-0502)
* Shebang lines longer than 64 characters are truncated
(CVE-2018-13259)
Impact
======
An attacker could entice a user to execute a specially crafted script
using Zsh, possibly resulting in execution of arbitrary code with the
privileges of the process.
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-5.6"
References
==========
[ 1 ] CVE-2018-0502
https://nvd.nist.gov/vuln/detail/CVE-2018-0502
[ 2 ] CVE-2018-13259
https://nvd.nist.gov/vuln/detail/CVE-2018-13259
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201903-02
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 2019 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
--H1spWtNR+x+ondvy
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