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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: ksh security update
Advisory ID:       RHSA-2020:2210-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2020:2210
Issue date:        2020-05-19
CVE Names:         CVE-2019-14868 
=====================================================================

1. Summary:

An update for ksh is now available for Red Hat Enterprise Linux 7.4
Advanced Update Support, Red Hat Enterprise Linux 7.4 Telco Extended Update
Support, and Red Hat Enterprise Linux 7.4 Update Services for SAP
Solutions.

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 Server AUS (v. 7.4) - x86_64
Red Hat Enterprise Linux Server E4S (v. 7.4) - ppc64le, x86_64
Red Hat Enterprise Linux Server TUS (v. 7.4) - x86_64

3. Description:

KornShell (ksh) is a Unix shell developed by AT&T Bell Laboratories, which
is backward-compatible with the Bourne shell (sh) and includes many
features of the C shell. The most recent version is KSH-93. KornShell
complies with the POSIX.2 standard (IEEE Std 1003.2-1992).

Security Fix(es):

* ksh: certain environment variables interpreted as arithmetic expressions
on startup, leading to code injection (CVE-2019-14868)

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/):

1757324 - CVE-2019-14868 ksh: certain environment variables interpreted as
 arithmetic expressions on startup, leading to code injection

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 7.4):

Source:
ksh-20120801-36.el7_4.src.rpm

x86_64:
ksh-20120801-36.el7_4.x86_64.rpm
ksh-debuginfo-20120801-36.el7_4.x86_64.rpm

Red Hat Enterprise Linux Server E4S (v. 7.4):

Source:
ksh-20120801-36.el7_4.src.rpm

ppc64le:
ksh-20120801-36.el7_4.ppc64le.rpm
ksh-debuginfo-20120801-36.el7_4.ppc64le.rpm

x86_64:
ksh-20120801-36.el7_4.x86_64.rpm
ksh-debuginfo-20120801-36.el7_4.x86_64.rpm

Red Hat Enterprise Linux Server TUS (v. 7.4):

Source:
ksh-20120801-36.el7_4.src.rpm

x86_64:
ksh-20120801-36.el7_4.x86_64.rpm
ksh-debuginfo-20120801-36.el7_4.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-2019-14868
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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