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

Synopsis:          Low: sudo security and bug fix update
Advisory ID:       RHSA-2021:1723-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:1723
Issue date:        2021-05-18
CVE Names:         CVE-2021-23239 CVE-2021-23240 
=====================================================================

1. Summary:

An update for sudo 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 sudo packages contain the sudo utility which allows system
administrators to provide certain users with the permission to execute
privileged commands, which are used for system management purposes, without
having to log in as root.

Security Fix(es):

* sudo: symbolic link attack in SELinux-enabled sudoedit (CVE-2021-23240)

* sudo: possible directory existence test due to race condition in sudoedit
(CVE-2021-23239)

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/):

1915052 - CVE-2021-23239 sudo: possible directory existence test due to race
 condition in sudoedit
1915053 - CVE-2021-23240 sudo: symbolic link attack in SELinux-enabled sudoedit
1923825 - Upstream URL need to be updated

6. Package List:

Red Hat Enterprise Linux BaseOS (v. 8):

Source:
sudo-1.8.29-7.el8.src.rpm

aarch64:
sudo-1.8.29-7.el8.aarch64.rpm
sudo-debuginfo-1.8.29-7.el8.aarch64.rpm
sudo-debugsource-1.8.29-7.el8.aarch64.rpm

ppc64le:
sudo-1.8.29-7.el8.ppc64le.rpm
sudo-debuginfo-1.8.29-7.el8.ppc64le.rpm
sudo-debugsource-1.8.29-7.el8.ppc64le.rpm

s390x:
sudo-1.8.29-7.el8.s390x.rpm
sudo-debuginfo-1.8.29-7.el8.s390x.rpm
sudo-debugsource-1.8.29-7.el8.s390x.rpm

x86_64:
sudo-1.8.29-7.el8.x86_64.rpm
sudo-debuginfo-1.8.29-7.el8.x86_64.rpm
sudo-debugsource-1.8.29-7.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-2021-23239
https://access.redhat.com/security/cve/CVE-2021-23240
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@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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