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

Synopsis:          Important: nginx:1.18 security update
Advisory ID:       RHSA-2021:2259-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:2259
Issue date:        2021-06-07
CVE Names:         CVE-2021-23017 
=====================================================================

1. Summary:

An update for the nginx:1.18 module is now available for Red Hat Enterprise
Linux 8.

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 AppStream (v. 8) - aarch64, noarch, ppc64le, s390x,
 x86_64

3. Description:

nginx is a web and proxy server supporting HTTP and other protocols, with a
focus on high concurrency, performance, and low memory usage. 

Security Fix(es):

* nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a
pointer to a root domain name (CVE-2021-23017)

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/):

1963121 - CVE-2021-23017 nginx: Off-by-one in ngx_resolver_copy() when labels
 are followed by a pointer to a root domain name

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
nginx-1.18.0-3.module+el8.4.0+11152+f736ed63.1.src.rpm

aarch64:
nginx-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rpm
nginx-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rpm
nginx-debugsource-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rpm
nginx-mod-http-image-filter-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rp
m
nginx-mod-http-image-filter-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rp
m
nginx-mod-http-perl-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rpm
nginx-mod-http-perl-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rp
m
nginx-mod-http-xslt-filter-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rpm
nginx-mod-http-xslt-filter-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rp
m
nginx-mod-mail-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rpm
nginx-mod-mail-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rpm
nginx-mod-stream-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rpm
nginx-mod-stream-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.aarch64.rpm

noarch:
nginx-all-modules-1.18.0-3.module+el8.4.0+11152+f736ed63.1.noarch.rpm
nginx-filesystem-1.18.0-3.module+el8.4.0+11152+f736ed63.1.noarch.rpm

ppc64le:
nginx-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rpm
nginx-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rpm
nginx-debugsource-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rpm
nginx-mod-http-image-filter-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rp
m
nginx-mod-http-image-filter-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rp
m
nginx-mod-http-perl-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rpm
nginx-mod-http-perl-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rp
m
nginx-mod-http-xslt-filter-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rpm
nginx-mod-http-xslt-filter-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rp
m
nginx-mod-mail-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rpm
nginx-mod-mail-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rpm
nginx-mod-stream-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rpm
nginx-mod-stream-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.ppc64le.rpm

s390x:
nginx-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rpm
nginx-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rpm
nginx-debugsource-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rpm
nginx-mod-http-image-filter-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rpm
nginx-mod-http-image-filter-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rp
m
nginx-mod-http-perl-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rpm
nginx-mod-http-perl-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rp
m
nginx-mod-http-xslt-filter-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rpm
nginx-mod-http-xslt-filter-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rp
m
nginx-mod-mail-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rpm
nginx-mod-mail-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rpm
nginx-mod-stream-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rpm
nginx-mod-stream-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.s390x.rpm

x86_64:
nginx-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rpm
nginx-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rpm
nginx-debugsource-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rpm
nginx-mod-http-image-filter-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rpm
nginx-mod-http-image-filter-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rp
m
nginx-mod-http-perl-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rpm
nginx-mod-http-perl-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rp
m
nginx-mod-http-xslt-filter-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rpm
nginx-mod-http-xslt-filter-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rp
m
nginx-mod-mail-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rpm
nginx-mod-mail-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rpm
nginx-mod-stream-1.18.0-3.module+el8.4.0+11152+f736ed63.1.x86_64.rpm
nginx-mod-stream-debuginfo-1.18.0-3.module+el8.4.0+11152+f736ed63.1.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-2021-23017
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 2021 Red Hat, Inc.
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