[ASA-201809-3] zsh: insufficient validation

[Jelle van der Waa]

Arch Linux Security Advisory ASA-201809-3
=========================================

Severity: Low
Date    : 2018-09-24
CVE-ID  : CVE-2018-0502 CVE-2018-13259
Package : zsh
Type    : insufficient validation
Remote  : No
Link    : https://security.archlinux.org/AVG-764

Summary
=======

The package zsh before version 5.6-1 is vulnerable to insufficient
validation.

Resolution
==========

Upgrade to 5.6-1.

# pacman -Syu "zsh>=5.6-1"

The problems have been fixed upstream in version 5.6.

Workaround
==========

None.

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

- CVE-2018-0502 (insufficient validation)

An issue was discovered in zsh before 5.6. The beginning of a #! script
file was mishandled, potentially leading to an execve call to a program
named on the second line.

- CVE-2018-13259 (insufficient validation)

An issue was discovered in zsh before 5.6. Shebang lines exceeding 64
characters were truncated, potentially leading to an execve call to a
program name that is a substring of the intended one.

Impact
======

A local attacker is able to execute arbitrary commands via a specially
crafted shell script.

References
==========

https://www.zsh.org/mla/zsh-announce/136
https://bugs.debian.org/908000
https://sourceforge.net/p/zsh/code/ci/1c4c7b6a4d17294df028322b70c53803a402233d
https://security.archlinux.org/CVE-2018-0502
https://security.archlinux.org/CVE-2018-13259
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