Moderate: bind security, bug fix, and enhancement update

Topic

An update for bind is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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.

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.

The following packages have been upgraded to a later upstream version: bind (9.11.36). (BZ#2013993)

Security Fix(es):

• bind: Lame cache can be abused to severely degrade resolver performance (CVE-2021-25219)

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 8.6 Release Notes linked from the References section.

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.

Affected Products

• Red Hat Enterprise Linux for ARM 64 8 aarch64

Fixes

• BZ - 1934035 - softshm can be removed as weak deps as its only in buildroot
• BZ - 1950714 - SELinux is preventing /usr/sbin/named from 'name_bind' accesses on the udp_socket port 61000.
• BZ - 2013993 - Rebase to the last BIND 9.11.36 release
• BZ - 2017636 - CVE-2021-25219 bind: Lame cache can be abused to severely degrade resolver performance
• BZ - 2021814 - Please rebuild with json-c-0.13.1-3
• BZ - 2030239 - named consumed too much memory and failed to reload.

CVEs

• CVE-2021-25219

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.6_release_notes/