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RedHat: RHSA-2020-0853-01 Important: Zsh Security Risk and Update

red hat
Calendar Grey March 17, 2020
Dist Redhat Esm H88
Crucial zsh security patch for CentOS 7 resolves a vulnerability related to improper permissions in the zsh environment.
An update for zsh is now available for Red Hat Enterprise Linux 7

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

Summary

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.

Topics%20covered

Topics Covered

security advisory Red Hat Enterprise Linux important security impact zsh command interpreter insecure privileges

References

https://access.redhat.com/security/cve/CVE-2019-20044 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux Client (v. 7):
Source: zsh-5.0.2-34.el7_7.2.src.rpm
x86_64: zsh-5.0.2-34.el7_7.2.x86_64.rpm zsh-debuginfo-5.0.2-34.el7_7.2.x86_64.rpm
Red Hat Enterprise Linux Client Optional (v. 7):
x86_64: zsh-debuginfo-5.0.2-34.el7_7.2.x86_64.rpm zsh-html-5.0.2-34.el7_7.2.x86_64.rpm
Red Hat Enterprise Linux ComputeNode (v. 7):
Source: zsh-5.0.2-34.el7_7.2.src.rpm
x86_64: zsh-5.0.2-34.el7_7.2.x86_64.rpm zsh-debuginfo-5.0.2-34.el7_7.2.x86_64.rpm
Red Hat Enterprise Linux ComputeNode Optional (v. 7):
x86_64: zsh-debuginfo-5.0.2-34.el7_7.2.x86_64.rpm zsh-html-5.0.2-34.el7_7.2.x86_64.rpm
Red Hat Enterprise Linux Server (v. 7):
Source: zsh-5.0.2-34.el7_7.2.src.rpm
ppc64: zsh-5.0.2-34.el7_7.2.ppc64.rpm zsh-debuginfo-5.0.2-34.el7_7.2.ppc64.rpm
ppc64le: zsh-5.0.2-34.el7_7.2.ppc64le.rpm zsh-debuginfo-5.0.2-34.el7_7.2.ppc64le.rpm
s390x: zsh-5.0.2-34.el7_7.2.s390x.rpm zsh-debuginfo-5.0.2-34.el7_7.2.s390x.rpm
x86_64: zsh-5.0.2-34.el7_7.2.x86_64.rpm zsh-debuginfo-5.0.2-34.el7_7.2.x86_64.rpm
Red Hat Enterprise Linux Server Optional (v. 7):
ppc64: zsh-debuginfo-5.0.2-34.el7_7.2.ppc64.rpm zsh-html-5.0.2-34.el7_7.2.ppc64.rpm
ppc64le: zsh-debuginfo-5.0.2-34.el7_7.2.ppc64le.rpm zsh-html-5.0.2-34.el7_7.2.ppc64le.rpm
s390x: zsh-debuginfo-5.0.2-34.el7_7.2.s390x.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2020:0853-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:0853
Issue date: 2020-03-17

Topic

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 impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory Red Hat Enterprise Linux important security impact zsh command interpreter insecure privileges

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

Bugs Fixed

1804859 - CVE-2019-20044 zsh: insecure dropping of privileges when unsetting PRIVILEGED option

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