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AUSCERT External Security Bulletin Redistribution
ESB-2020.0973
zsh security update
19 March 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: zsh
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 6
Red Hat Enterprise Linux WS/Desktop 6
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-20044
Reference: ESB-2020.0952
Original Bulletin:
https://access.redhat.com/errata/RHSA-2020:0892
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Red Hat Security Advisory
Synopsis: Important: zsh security update
Advisory ID: RHSA-2020:0892-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:0892
Issue date: 2020-03-18
CVE Names: CVE-2019-20044
=====================================================================
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 Important. 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: insecure dropping of privileges when unsetting PRIVILEGED option
(CVE-2019-20044)
For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in 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/):
1804859 - CVE-2019-20044 zsh: insecure dropping of privileges when unsetting PRIVILEGED option
6. Package List:
Red Hat Enterprise Linux Desktop (v. 6):
Source:
zsh-4.3.11-11.el6_10.src.rpm
i386:
zsh-4.3.11-11.el6_10.i686.rpm
zsh-debuginfo-4.3.11-11.el6_10.i686.rpm
x86_64:
zsh-4.3.11-11.el6_10.x86_64.rpm
zsh-debuginfo-4.3.11-11.el6_10.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
i386:
zsh-debuginfo-4.3.11-11.el6_10.i686.rpm
zsh-html-4.3.11-11.el6_10.i686.rpm
x86_64:
zsh-debuginfo-4.3.11-11.el6_10.x86_64.rpm
zsh-html-4.3.11-11.el6_10.x86_64.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
zsh-4.3.11-11.el6_10.src.rpm
x86_64:
zsh-4.3.11-11.el6_10.x86_64.rpm
zsh-debuginfo-4.3.11-11.el6_10.x86_64.rpm
Red Hat Enterprise Linux HPC Node Optional (v. 6):
x86_64:
zsh-debuginfo-4.3.11-11.el6_10.x86_64.rpm
zsh-html-4.3.11-11.el6_10.x86_64.rpm
Red Hat Enterprise Linux Server (v. 6):
Source:
zsh-4.3.11-11.el6_10.src.rpm
i386:
zsh-4.3.11-11.el6_10.i686.rpm
zsh-debuginfo-4.3.11-11.el6_10.i686.rpm
ppc64:
zsh-4.3.11-11.el6_10.ppc64.rpm
zsh-debuginfo-4.3.11-11.el6_10.ppc64.rpm
s390x:
zsh-4.3.11-11.el6_10.s390x.rpm
zsh-debuginfo-4.3.11-11.el6_10.s390x.rpm
x86_64:
zsh-4.3.11-11.el6_10.x86_64.rpm
zsh-debuginfo-4.3.11-11.el6_10.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 6):
i386:
zsh-debuginfo-4.3.11-11.el6_10.i686.rpm
zsh-html-4.3.11-11.el6_10.i686.rpm
ppc64:
zsh-debuginfo-4.3.11-11.el6_10.ppc64.rpm
zsh-html-4.3.11-11.el6_10.ppc64.rpm
s390x:
zsh-debuginfo-4.3.11-11.el6_10.s390x.rpm
zsh-html-4.3.11-11.el6_10.s390x.rpm
x86_64:
zsh-debuginfo-4.3.11-11.el6_10.x86_64.rpm
zsh-html-4.3.11-11.el6_10.x86_64.rpm
Red Hat Enterprise Linux Workstation (v. 6):
Source:
zsh-4.3.11-11.el6_10.src.rpm
i386:
zsh-4.3.11-11.el6_10.i686.rpm
zsh-debuginfo-4.3.11-11.el6_10.i686.rpm
x86_64:
zsh-4.3.11-11.el6_10.x86_64.rpm
zsh-debuginfo-4.3.11-11.el6_10.x86_64.rpm
Red Hat Enterprise Linux Workstation Optional (v. 6):
i386:
zsh-debuginfo-4.3.11-11.el6_10.i686.rpm
zsh-html-4.3.11-11.el6_10.i686.rpm
x86_64:
zsh-debuginfo-4.3.11-11.el6_10.x86_64.rpm
zsh-html-4.3.11-11.el6_10.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-2019-20044
https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2020 Red Hat, Inc.
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