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Red Hat Security Advisory

Synopsis: Moderate: zsh security and bug fix update
Advisory ID: RHSA-2018:3073-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2018:3073
Issue date: 2018-10-30
CVE Names: CVE-2014-10071 CVE-2014-10072 CVE-2017-18205
CVE-2017-18206 CVE-2018-1071 CVE-2018-1083
CVE-2018-1100 CVE-2018-7549
=====================================================================

1. Summary:

An update for zsh is now available for Red Hat Enterprise Linux 7.

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 Client (v. 7) – x86_64
Red Hat Enterprise Linux Client Optional (v. 7) – x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) – x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) – x86_64
Red Hat Enterprise Linux Server (v. 7) – ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) – ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 7) – x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) – x86_64
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) – aarch64, ppc64le, s390x
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) – aarch64, ppc64le, s390x

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 for very long fds in >& fd syntax (CVE-2014-10071)

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

* zsh: NULL dereference in cd in sh compatibility mode under given
circumstances (CVE-2017-18205)

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

* zsh: Stack-based buffer overflow in exec.c:hashcmd() (CVE-2018-1071)

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

* zsh: crash on copying empty hash table (CVE-2018-7549)

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, CVE-2018-1071, 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 7.6 Release 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
1549855 – CVE-2014-10071 zsh: buffer overflow for very long fds in >& fd syntax
1549858 – CVE-2018-7549 zsh: crash on copying empty hash table
1549861 – CVE-2017-18206 zsh: buffer overrun in symlinks
1549862 – CVE-2017-18205 zsh: NULL dereference in cd in sh compatibility mode under given circumstances
1553531 – CVE-2018-1071 zsh: Stack-based buffer overflow in exec.c:hashcmd()
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 Client (v. 7):

Source:
zsh-5.0.2-31.el7.src.rpm

x86_64:
zsh-5.0.2-31.el7.x86_64.rpm
zsh-debuginfo-5.0.2-31.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
zsh-debuginfo-5.0.2-31.el7.x86_64.rpm
zsh-html-5.0.2-31.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
zsh-5.0.2-31.el7.src.rpm

x86_64:
zsh-5.0.2-31.el7.x86_64.rpm
zsh-debuginfo-5.0.2-31.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
zsh-debuginfo-5.0.2-31.el7.x86_64.rpm
zsh-html-5.0.2-31.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
zsh-5.0.2-31.el7.src.rpm

ppc64:
zsh-5.0.2-31.el7.ppc64.rpm
zsh-debuginfo-5.0.2-31.el7.ppc64.rpm

ppc64le:
zsh-5.0.2-31.el7.ppc64le.rpm
zsh-debuginfo-5.0.2-31.el7.ppc64le.rpm

s390x:
zsh-5.0.2-31.el7.s390x.rpm
zsh-debuginfo-5.0.2-31.el7.s390x.rpm

x86_64:
zsh-5.0.2-31.el7.x86_64.rpm
zsh-debuginfo-5.0.2-31.el7.x86_64.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

Source:
zsh-5.0.2-31.el7.src.rpm

aarch64:
zsh-5.0.2-31.el7.aarch64.rpm
zsh-debuginfo-5.0.2-31.el7.aarch64.rpm

ppc64le:
zsh-5.0.2-31.el7.ppc64le.rpm
zsh-debuginfo-5.0.2-31.el7.ppc64le.rpm

s390x:
zsh-5.0.2-31.el7.s390x.rpm
zsh-debuginfo-5.0.2-31.el7.s390x.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):

aarch64:
zsh-debuginfo-5.0.2-31.el7.aarch64.rpm
zsh-html-5.0.2-31.el7.aarch64.rpm

ppc64le:
zsh-debuginfo-5.0.2-31.el7.ppc64le.rpm
zsh-html-5.0.2-31.el7.ppc64le.rpm

s390x:
zsh-debuginfo-5.0.2-31.el7.s390x.rpm
zsh-html-5.0.2-31.el7.s390x.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
zsh-debuginfo-5.0.2-31.el7.ppc64.rpm
zsh-html-5.0.2-31.el7.ppc64.rpm

ppc64le:
zsh-debuginfo-5.0.2-31.el7.ppc64le.rpm
zsh-html-5.0.2-31.el7.ppc64le.rpm

s390x:
zsh-debuginfo-5.0.2-31.el7.s390x.rpm
zsh-html-5.0.2-31.el7.s390x.rpm

x86_64:
zsh-debuginfo-5.0.2-31.el7.x86_64.rpm
zsh-html-5.0.2-31.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
zsh-5.0.2-31.el7.src.rpm

x86_64:
zsh-5.0.2-31.el7.x86_64.rpm
zsh-debuginfo-5.0.2-31.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
zsh-debuginfo-5.0.2-31.el7.x86_64.rpm
zsh-html-5.0.2-31.el7.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-2014-10071
https://access.redhat.com/security/cve/CVE-2014-10072
https://access.redhat.com/security/cve/CVE-2017-18205
https://access.redhat.com/security/cve/CVE-2017-18206
https://access.redhat.com/security/cve/CVE-2018-1071
https://access.redhat.com/security/cve/CVE-2018-1083
https://access.redhat.com/security/cve/CVE-2018-1100
https://access.redhat.com/security/cve/CVE-2018-7549
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.6_release_notes/index

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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