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RedHat: RHSA-2021-1479 Important: Bind DNS Fix, Critical DoS Risk

red hat
Calendar Grey May 3, 2021
Dist Redhat Esm H88
Crucial patch for Red Hat Enterprise Linux tackling a significant bind security issue. Implement updates without delay.
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 Lin...

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.

Summary

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.

Topics%20covered

Topics Covered

security advisory bind issue important fix red hat enterprise linux dns

References

https://access.redhat.com/security/cve/CVE-2021-25215 https://access.redhat.com/security/updates/classification/#important

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

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

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

Topic

An update for bind is now available for Red Hat Enterprise Linux 7.4Advanced Update Support, Red Hat Enterprise Linux 7.4 Telco Extended UpdateSupport, and Red Hat Enterprise Linux 7.4 Update Services for SAPSolutions.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory bind issue important fix red hat enterprise linux dns

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

Bugs Fixed

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

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