Synopsis

Moderate: bind security, bug fix, and enhancement update

Type/Severity

Security Advisory: Moderate

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 (9.11.20). (BZ#1818785)

Security Fix(es):

• bind: asterisk character in an empty non-terminal can cause an assertion failure in rbtdb.c (CVE-2020-8619)
• bind: truncated TSIG response can lead to an assertion failure (CVE-2020-8622)
• bind: remotely triggerable assertion failure in pk11.c (CVE-2020-8623)
• bind: incorrect enforcement of update-policy rules of type "subdomain" (CVE-2020-8624)

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 8.3 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 x86_64 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64

Fixes

• BZ - 1693395 - Remove revoked KSK from trusted keys
• BZ - 1749505 - internal test suite failures
• BZ - 1814158 - bind internal testsuite, random failure in autosign
• BZ - 1817870 - /usr/bin/nsupdate -g segfault when connect to AD
• BZ - 1847244 - CVE-2020-8619 bind: asterisk character in an empty non-terminal can cause an assertion failure in rbtdb.c
• BZ - 1848169 - named-checkconf fails to validate configuration file with CIDRs with host bits set
• BZ - 1859454 - named-pkcs11.service: (named-pkcs11) of user 25 dumped core.
• BZ - 1869473 - CVE-2020-8622 bind: truncated TSIG response can lead to an assertion failure
• BZ - 1869477 - CVE-2020-8623 bind: remotely triggerable assertion failure in pk11.c
• BZ - 1869480 - CVE-2020-8624 bind: incorrect enforcement of update-policy rules of type "subdomain"

CVEs

• CVE-2020-8619
• CVE-2020-8622
• CVE-2020-8623
• CVE-2020-8624

References