Moderate: bind security and bug fix update

Synopsis

Moderate: bind security and bug fix update

Type/Severity

Security Advisory: Moderate

Topic

An update for bind is now available for Red Hat Enterprise Linux 7.

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.

Security Fix(es):

• bind: TCP Pipelining doesn't limit TCP clients on a single connection (CVE-2019-6477)
  
• bind: An assertion failure if a trust anchor rolls over to an unsupported key algorithm when using managed-keys (CVE-2018-5745)
  
• bind: Controls for zone transfers may not be properly applied to DLZs if the zones are writable (CVE-2019-6465)
  

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 7.8 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 Server 7 x86_64
• Red Hat Enterprise Linux Workstation 7 x86_64
• Red Hat Enterprise Linux Desktop 7 x86_64
• Red Hat Enterprise Linux for IBM z Systems 7 s390x
• Red Hat Enterprise Linux for Power, big endian 7 ppc64
• Red Hat Enterprise Linux for Scientific Computing 7 x86_64
• Red Hat Enterprise Linux for Power, little endian 7 ppc64le

Fixes

• BZ - 1679303 - CVE-2018-5745 bind: An assertion failure if a trust anchor rolls over to an unsupported key algorithm when using managed-keys
• BZ - 1679304 - CVE-2019-6465 bind: Controls for zone transfers may not be properly applied to DLZs if the zones are writable
• BZ - 1743572 - nslookup doesn't try to search the search in /etc/resolv.conf
• BZ - 1753259 - Regression: BIND 9.11 listens on [::]:53 even it isn't configured to do so
• BZ - 1773617 - CVE-2019-6477 bind: TCP Pipelining doesn't limit TCP clients on a single connection

CVEs

• CVE-2018-5745
• CVE-2019-6465
• CVE-2019-6477

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/7.8_release_notes/index