RHSA-2016:2142 - Security Advisory

Topic

An update for bind97 is now available for Red Hat Enterprise Linux 5.

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.

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):

• A denial of service flaw was found in the way BIND handled responses

containing a DNAME answer. A remote attacker could use this flaw to make named
exit unexpectedly with an assertion failure via a specially crafted DNS
response. (CVE-2016-8864)

Red Hat would like to thank ISC for reporting this issue. Upstream acknowledges
Tony Finch (University of Cambridge) and Marco Davids (SIDN Labs) as the
original reporters.

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 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc

Fixes

• BZ - 1389652 - CVE-2016-8864 bind: assertion failure while handling responses containing a DNAME answer

CVEs

• CVE-2016-8864

References

• https://access.redhat.com/security/updates/classification/#important
• https://kb.isc.org/article/AA-01434