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[RHSA-2021:1475-01] Important: bind security update
Posted on 03 May 2021
===================================================================== Red Hat Security Advisory
Synopsis: Important: bind security update
Advisory ID: RHSA-2021:1475-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:1475
Issue date: 2021-05-03
CVE Names: CVE-2021-25215
An update for bind is now available for Red Hat Enterprise Linux 7.3
Advanced Update Support.
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. 7.3) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.3) - x86_64
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.
* bind: An assertion check can fail while answering queries for DNAME
records that require the DNAME to be processed to resolve itself
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.
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
After installing the update, the BIND daemon (named) will be restarted
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. 7.3):
Red Hat Enterprise Linux Server Optional AUS (v. 7.3):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <email@example.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.