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Red Hat Enterprise Linux 7.3 RHSA-2020:5351-01 Important Code Injection

red hat
Calendar Grey December 7, 2020
Dist Redhat Esm H88
Remain informed about the important security update for the ksh shell in Red Hat Enterprise Linux version 7.3 and discover how to implement the necessary fixes.
An update for ksh is now available for Red Hat Enterprise Linux 7.3 Advanced Update Support

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

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.

Topics%20covered

Topics Covered

security advisory security issue Red Hat software update Red Hat Enterprise Linux important security impact code injection important patch ksh ksh update

References

https://access.redhat.com/security/cve/CVE-2019-14868 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Server AUS (v. 7.3):
Source: ksh-20120801-27.el7_3.src.rpm
x86_64: ksh-20120801-27.el7_3.x86_64.rpm ksh-debuginfo-20120801-27.el7_3.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


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2020:5351-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:5351
Issue date: 2020-12-07

Topic

An update for ksh is now available for Red Hat Enterprise Linux 7.3Advanced Update Support.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 security issue Red Hat software update Red Hat Enterprise Linux important security impact code injection important patch ksh ksh update

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 7.3) - x86_64

Bugs Fixed

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

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