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

Synopsis:          Important: bind security update
Advisory ID:       RHSA-2021:1479-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:1479
Issue date:        2021-05-03
CVE Names:         CVE-2021-25215 
=====================================================================

1. Summary:

An update for bind 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) - noarch, x86_64
Red Hat Enterprise Linux Server E4S (v. 7.4) - noarch, ppc64le, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.4) - x86_64
Red Hat Enterprise Linux Server Optional E4S (v. 7.4) - ppc64le, x86_64
Red Hat Enterprise Linux Server Optional TUS (v. 7.4) - x86_64
Red Hat Enterprise Linux Server TUS (v. 7.4) - noarch, x86_64

3. Description:

The Berkeley Internet Name Domain (BIND) is an implementation of the Domain
Name System (DNS) protocols. BIND includes a DNS server (named); a resolver
library (routines for applications to use when interfacing with DNS); and
tools for verifying that the DNS server is operating correctly.

Security Fix(es):

* bind: An assertion check can fail while answering queries for DNAME
records that require the DNAME to be processed to resolve itself
(CVE-2021-25215)

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

After installing the update, the BIND daemon (named) will be restarted
automatically.

5. Bugs fixed (https://bugzilla.redhat.com/):

1953857 - CVE-2021-25215 bind: An assertion check can fail while answering
 queries for DNAME records that require the DNAME to be processed to resolve itself

6. Package List:

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

Source:
bind-9.9.4-51.el7_4.6.src.rpm

noarch:
bind-license-9.9.4-51.el7_4.6.noarch.rpm

x86_64:
bind-9.9.4-51.el7_4.6.x86_64.rpm
bind-chroot-9.9.4-51.el7_4.6.x86_64.rpm
bind-debuginfo-9.9.4-51.el7_4.6.i686.rpm
bind-debuginfo-9.9.4-51.el7_4.6.x86_64.rpm
bind-libs-9.9.4-51.el7_4.6.i686.rpm
bind-libs-9.9.4-51.el7_4.6.x86_64.rpm
bind-libs-lite-9.9.4-51.el7_4.6.i686.rpm
bind-libs-lite-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-libs-9.9.4-51.el7_4.6.i686.rpm
bind-pkcs11-libs-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-utils-9.9.4-51.el7_4.6.x86_64.rpm
bind-utils-9.9.4-51.el7_4.6.x86_64.rpm

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

Source:
bind-9.9.4-51.el7_4.6.src.rpm

noarch:
bind-license-9.9.4-51.el7_4.6.noarch.rpm

ppc64le:
bind-9.9.4-51.el7_4.6.ppc64le.rpm
bind-chroot-9.9.4-51.el7_4.6.ppc64le.rpm
bind-debuginfo-9.9.4-51.el7_4.6.ppc64le.rpm
bind-libs-9.9.4-51.el7_4.6.ppc64le.rpm
bind-libs-lite-9.9.4-51.el7_4.6.ppc64le.rpm
bind-pkcs11-9.9.4-51.el7_4.6.ppc64le.rpm
bind-pkcs11-libs-9.9.4-51.el7_4.6.ppc64le.rpm
bind-pkcs11-utils-9.9.4-51.el7_4.6.ppc64le.rpm
bind-utils-9.9.4-51.el7_4.6.ppc64le.rpm

x86_64:
bind-9.9.4-51.el7_4.6.x86_64.rpm
bind-chroot-9.9.4-51.el7_4.6.x86_64.rpm
bind-debuginfo-9.9.4-51.el7_4.6.i686.rpm
bind-debuginfo-9.9.4-51.el7_4.6.x86_64.rpm
bind-libs-9.9.4-51.el7_4.6.i686.rpm
bind-libs-9.9.4-51.el7_4.6.x86_64.rpm
bind-libs-lite-9.9.4-51.el7_4.6.i686.rpm
bind-libs-lite-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-libs-9.9.4-51.el7_4.6.i686.rpm
bind-pkcs11-libs-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-utils-9.9.4-51.el7_4.6.x86_64.rpm
bind-utils-9.9.4-51.el7_4.6.x86_64.rpm

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

Source:
bind-9.9.4-51.el7_4.6.src.rpm

noarch:
bind-license-9.9.4-51.el7_4.6.noarch.rpm

x86_64:
bind-9.9.4-51.el7_4.6.x86_64.rpm
bind-chroot-9.9.4-51.el7_4.6.x86_64.rpm
bind-debuginfo-9.9.4-51.el7_4.6.i686.rpm
bind-debuginfo-9.9.4-51.el7_4.6.x86_64.rpm
bind-libs-9.9.4-51.el7_4.6.i686.rpm
bind-libs-9.9.4-51.el7_4.6.x86_64.rpm
bind-libs-lite-9.9.4-51.el7_4.6.i686.rpm
bind-libs-lite-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-libs-9.9.4-51.el7_4.6.i686.rpm
bind-pkcs11-libs-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-utils-9.9.4-51.el7_4.6.x86_64.rpm
bind-utils-9.9.4-51.el7_4.6.x86_64.rpm

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

x86_64:
bind-debuginfo-9.9.4-51.el7_4.6.i686.rpm
bind-debuginfo-9.9.4-51.el7_4.6.x86_64.rpm
bind-devel-9.9.4-51.el7_4.6.i686.rpm
bind-devel-9.9.4-51.el7_4.6.x86_64.rpm
bind-lite-devel-9.9.4-51.el7_4.6.i686.rpm
bind-lite-devel-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-devel-9.9.4-51.el7_4.6.i686.rpm
bind-pkcs11-devel-9.9.4-51.el7_4.6.x86_64.rpm
bind-sdb-9.9.4-51.el7_4.6.x86_64.rpm
bind-sdb-chroot-9.9.4-51.el7_4.6.x86_64.rpm

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

ppc64le:
bind-debuginfo-9.9.4-51.el7_4.6.ppc64le.rpm
bind-devel-9.9.4-51.el7_4.6.ppc64le.rpm
bind-lite-devel-9.9.4-51.el7_4.6.ppc64le.rpm
bind-pkcs11-devel-9.9.4-51.el7_4.6.ppc64le.rpm
bind-sdb-9.9.4-51.el7_4.6.ppc64le.rpm
bind-sdb-chroot-9.9.4-51.el7_4.6.ppc64le.rpm

x86_64:
bind-debuginfo-9.9.4-51.el7_4.6.i686.rpm
bind-debuginfo-9.9.4-51.el7_4.6.x86_64.rpm
bind-devel-9.9.4-51.el7_4.6.i686.rpm
bind-devel-9.9.4-51.el7_4.6.x86_64.rpm
bind-lite-devel-9.9.4-51.el7_4.6.i686.rpm
bind-lite-devel-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-devel-9.9.4-51.el7_4.6.i686.rpm
bind-pkcs11-devel-9.9.4-51.el7_4.6.x86_64.rpm
bind-sdb-9.9.4-51.el7_4.6.x86_64.rpm
bind-sdb-chroot-9.9.4-51.el7_4.6.x86_64.rpm

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

x86_64:
bind-debuginfo-9.9.4-51.el7_4.6.i686.rpm
bind-debuginfo-9.9.4-51.el7_4.6.x86_64.rpm
bind-devel-9.9.4-51.el7_4.6.i686.rpm
bind-devel-9.9.4-51.el7_4.6.x86_64.rpm
bind-lite-devel-9.9.4-51.el7_4.6.i686.rpm
bind-lite-devel-9.9.4-51.el7_4.6.x86_64.rpm
bind-pkcs11-devel-9.9.4-51.el7_4.6.i686.rpm
bind-pkcs11-devel-9.9.4-51.el7_4.6.x86_64.rpm
bind-sdb-9.9.4-51.el7_4.6.x86_64.rpm
bind-sdb-chroot-9.9.4-51.el7_4.6.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-2021-25215
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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