RHSA-2016:1945 - 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 constructed a response to a

query that met certain criteria. A remote attacker could use this flaw to make
named exit unexpectedly with an assertion failure via a specially crafted DNS
request packet. (CVE-2016-2776)

Red Hat would like to thank ISC for reporting this issue.

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 - 1378380 - CVE-2016-2776 bind: assertion failure in buffer.c while building responses to a specifically constructed request

CVEs

• CVE-2016-2776

References

• https://access.redhat.com/security/updates/classification/#important
• https://kb.isc.org/article/AA-01419