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Red Hat Security Advisory 2018-1932-01

Red Hat Security Advisory 2018-1932-01
Posted Jun 20, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-1932-01 - The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell, but includes many enhancements. Zsh supports command-line editing, built-in spelling correction, programmable command completion, shell functions, a history mechanism, and more. Issues addressed include buffer overflow and code execution vulnerabilities.

tags | advisory, overflow, shell, vulnerability, code execution
systems | linux, redhat
advisories | CVE-2014-10072, CVE-2017-18206, CVE-2018-1083, CVE-2018-1100
MD5 | 7df45b65507cdbd916c317251f366d7a

Red Hat Security Advisory 2018-1932-01

Change Mirror Download
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=====================================================================
Red Hat Security Advisory

Synopsis: Moderate: zsh security update
Advisory ID: RHSA-2018:1932-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:1932
Issue date: 2018-06-19
CVE Names: CVE-2014-10072 CVE-2017-18206 CVE-2018-1083
CVE-2018-1100
=====================================================================

1. Summary:

An update for zsh is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

The zsh shell is a command interpreter usable as an interactive login shell
and as a shell script command processor. Zsh resembles the ksh shell (the
Korn shell), but includes many enhancements. Zsh supports command-line
editing, built-in spelling correction, programmable command completion,
shell functions (with autoloading), a history mechanism, and more.

Security Fix(es):

* zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c
(CVE-2018-1083)

* zsh: buffer overflow when scanning very long directory paths for symbolic
links (CVE-2014-10072)

* zsh: buffer overrun in symlinks (CVE-2017-18206)

* zsh: buffer overflow in utils.c:checkmailpath() can lead to local
arbitrary code execution (CVE-2018-1100)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

The CVE-2018-1083 and CVE-2018-1100 issues were discovered by Richard
Maciel Costa (Red Hat).

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 6.10 Release Notes and Red Hat Enterprise Linux 6.10
Technical Notes linked from the References section.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1549836 - CVE-2014-10072 zsh: buffer overflow when scanning very long directory paths for symbolic links
1549861 - CVE-2017-18206 zsh: buffer overrun in symlinks
1557382 - CVE-2018-1083 zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c
1563395 - CVE-2018-1100 zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
zsh-4.3.11-8.el6.src.rpm

i386:
zsh-4.3.11-8.el6.i686.rpm
zsh-debuginfo-4.3.11-8.el6.i686.rpm

x86_64:
zsh-4.3.11-8.el6.x86_64.rpm
zsh-debuginfo-4.3.11-8.el6.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
zsh-debuginfo-4.3.11-8.el6.i686.rpm
zsh-html-4.3.11-8.el6.i686.rpm

x86_64:
zsh-debuginfo-4.3.11-8.el6.x86_64.rpm
zsh-html-4.3.11-8.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
zsh-4.3.11-8.el6.src.rpm

x86_64:
zsh-4.3.11-8.el6.x86_64.rpm
zsh-debuginfo-4.3.11-8.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

x86_64:
zsh-debuginfo-4.3.11-8.el6.x86_64.rpm
zsh-html-4.3.11-8.el6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
zsh-4.3.11-8.el6.src.rpm

i386:
zsh-4.3.11-8.el6.i686.rpm
zsh-debuginfo-4.3.11-8.el6.i686.rpm

ppc64:
zsh-4.3.11-8.el6.ppc64.rpm
zsh-debuginfo-4.3.11-8.el6.ppc64.rpm

s390x:
zsh-4.3.11-8.el6.s390x.rpm
zsh-debuginfo-4.3.11-8.el6.s390x.rpm

x86_64:
zsh-4.3.11-8.el6.x86_64.rpm
zsh-debuginfo-4.3.11-8.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
zsh-debuginfo-4.3.11-8.el6.i686.rpm
zsh-html-4.3.11-8.el6.i686.rpm

ppc64:
zsh-debuginfo-4.3.11-8.el6.ppc64.rpm
zsh-html-4.3.11-8.el6.ppc64.rpm

s390x:
zsh-debuginfo-4.3.11-8.el6.s390x.rpm
zsh-html-4.3.11-8.el6.s390x.rpm

x86_64:
zsh-debuginfo-4.3.11-8.el6.x86_64.rpm
zsh-html-4.3.11-8.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
zsh-4.3.11-8.el6.src.rpm

i386:
zsh-4.3.11-8.el6.i686.rpm
zsh-debuginfo-4.3.11-8.el6.i686.rpm

x86_64:
zsh-4.3.11-8.el6.x86_64.rpm
zsh-debuginfo-4.3.11-8.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
zsh-debuginfo-4.3.11-8.el6.i686.rpm
zsh-html-4.3.11-8.el6.i686.rpm

x86_64:
zsh-debuginfo-4.3.11-8.el6.x86_64.rpm
zsh-html-4.3.11-8.el6.x86_64.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2014-10072
https://access.redhat.com/security/cve/CVE-2017-18206
https://access.redhat.com/security/cve/CVE-2018-1083
https://access.redhat.com/security/cve/CVE-2018-1100
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-US/red_hat_enterprise_linux/6/html/6.10_release_notes/index.html
https://access.redhat.com/documentation/en-US/red_hat_enterprise_linux/6/html/6.10_technical_notes/index.html

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2018 Red Hat, Inc.
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