GLSA 201903-02: Zsh: User-assisted execution of arbitrary code

http://security.gentoo.org/

Severity:	normal
Title:	Zsh: User-assisted execution of arbitrary code
Date:	03/10/2019
Bugs:	#665278
ID:	201903-02

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

Package	Vulnerable	Unaffected	Architecture(s)
app-shells/zsh	< 5.6	>= 5.6	All supported architectures

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

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-201903-02.xml

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.