[RHSA-2021:1679-01] Low: bash security and bug fix update

[Security announcements for all Red Hat products and services.]

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                   Red Hat Security Advisory

Synopsis:          Low: bash security and bug fix update
Advisory ID:       RHSA-2021:1679-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:1679
Issue date:        2021-05-18
CVE Names:         CVE-2019-18276 
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1. Summary:

An update for bash is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact
of Low. 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 BaseOS (v. 8) - aarch64, ppc64le, s390x, x86_64

3. Description:

The bash packages provide Bash (Bourne-again shell), which is the default
shell for Red Hat Enterprise Linux.

Security Fix(es):

* bash: when effective UID is not equal to its real UID the saved UID is
not dropped (CVE-2019-18276)

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.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 8.4 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/):

1778309 - CVE-2019-18276 bash: when effective UID is not equal to its real UID the saved UID is not dropped
1890888 - Took long time to return when bash -c 'exit 2 & wait $!' run in the big size LimitNPROC values

6. Package List:

Red Hat Enterprise Linux BaseOS (v. 8):

Source:
bash-4.4.19-14.el8.src.rpm

aarch64:
bash-4.4.19-14.el8.aarch64.rpm
bash-debuginfo-4.4.19-14.el8.aarch64.rpm
bash-debugsource-4.4.19-14.el8.aarch64.rpm
bash-doc-4.4.19-14.el8.aarch64.rpm

ppc64le:
bash-4.4.19-14.el8.ppc64le.rpm
bash-debuginfo-4.4.19-14.el8.ppc64le.rpm
bash-debugsource-4.4.19-14.el8.ppc64le.rpm
bash-doc-4.4.19-14.el8.ppc64le.rpm

s390x:
bash-4.4.19-14.el8.s390x.rpm
bash-debuginfo-4.4.19-14.el8.s390x.rpm
bash-debugsource-4.4.19-14.el8.s390x.rpm
bash-doc-4.4.19-14.el8.s390x.rpm

x86_64:
bash-4.4.19-14.el8.x86_64.rpm
bash-debuginfo-4.4.19-14.el8.x86_64.rpm
bash-debugsource-4.4.19-14.el8.x86_64.rpm
bash-doc-4.4.19-14.el8.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-2019-18276
https://access.redhat.com/security/updates/classification/#low
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.4_release_notes/

8. Contact:

The Red Hat security contact is <secalert at redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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