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Red Hat: RHSA-2016-0078-01 Critical: BIND Denial of Service Vulnerabilities

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Calendar Grey January 28, 2016
Scroller Redhat
Important Red Hat security announcement addressing vulnerabilities in BIND. Essential patches can be found for versions 6.4 and 6.5.
Updated bind packages that fix multiple security issues are now available for Red Hat Enterprise Linux 6.4 and 6.5 Advanced Update Support

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Summary

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.
A denial of service flaw was found in the way BIND followed DNS delegations. A remote attacker could use a specially crafted zone containing a large number of referrals which, when looked up and processed, would cause named to use excessive amounts of memory or crash. (CVE-2014-8500)
A flaw was found in the way BIND handled requests for TKEY DNS resource records. A remote attacker could use this flaw to make named (functioning as an authoritative DNS server or a DNS resolver) exit unexpectedly with an assertion failure via a specially crafted DNS request packet. (CVE-2015-5477)
A denial of service flaw was found in the way BIND parsed certain malformed DNSSEC keys. A remote attacker could use this flaw to send a specially crafted DNS query (for example, a query requiring a response from a zone containing a deliberately malformed key) that would cause named functioning as a validating resolver to crash. (CVE-2015-5722)
A denial of service flaw was found in the way BIND processed certain records with malformed class attributes. A remote attacker could use this flaw to send a query to request a cached record with a malformed class attribute that would cause named functioning as an authoritative or recursive server to crash. (CVE-2015-8000)
Note: This issue affects authoritative servers as well as recursive servers, however authoritative servers are at limited risk if they perform authentication when making recursive queries to resolve addresses for servers listed in NS RRSETs.
Red Hat would like to thank ISC for reporting the CVE-2015-5477, CVE-2015-5722, and CVE-2015-8000 issues. Upstream acknowledges Jonathan Foote as the original reporter of CVE-2015-5477, and Hanno Böck as the original reporter of CVE-2015-5722.
All bind users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing the update, the BIND daemon (named) will be restarted automatically.

Topics%20covered

Topics Covered

security advisory denial of service security update update red hat bind important

References

https://access.redhat.com/security/cve/CVE-2014-8500 https://access.redhat.com/security/cve/CVE-2015-5477 https://access.redhat.com/security/cve/CVE-2015-5722 https://access.redhat.com/security/cve/CVE-2015-8000 https://access.redhat.com/security/updates/classification#important https://kb.isc.org/docs/aa-01216 https://kb.isc.org/docs/aa-01272 https://kb.isc.org/docs/aa-01287 https://kb.isc.org/docs/aa-01317

Package List

Red Hat Enterprise Linux Server AUS (v. 6.4):
Source: bind-9.8.2-0.17.rc1.el6_4.7.src.rpm
i386: bind-9.8.2-0.17.rc1.el6_4.7.i686.rpm bind-chroot-9.8.2-0.17.rc1.el6_4.7.i686.rpm bind-debuginfo-9.8.2-0.17.rc1.el6_4.7.i686.rpm bind-libs-9.8.2-0.17.rc1.el6_4.7.i686.rpm bind-utils-9.8.2-0.17.rc1.el6_4.7.i686.rpm
ppc64: bind-9.8.2-0.17.rc1.el6_4.7.ppc64.rpm bind-chroot-9.8.2-0.17.rc1.el6_4.7.ppc64.rpm bind-debuginfo-9.8.2-0.17.rc1.el6_4.7.ppc.rpm bind-debuginfo-9.8.2-0.17.rc1.el6_4.7.ppc64.rpm bind-libs-9.8.2-0.17.rc1.el6_4.7.ppc.rpm bind-libs-9.8.2-0.17.rc1.el6_4.7.ppc64.rpm bind-utils-9.8.2-0.17.rc1.el6_4.7.ppc64.rpm
s390x: bind-9.8.2-0.17.rc1.el6_4.7.s390x.rpm bind-chroot-9.8.2-0.17.rc1.el6_4.7.s390x.rpm bind-debuginfo-9.8.2-0.17.rc1.el6_4.7.s390.rpm bind-debuginfo-9.8.2-0.17.rc1.el6_4.7.s390x.rpm bind-libs-9.8.2-0.17.rc1.el6_4.7.s390.rpm bind-libs-9.8.2-0.17.rc1.el6_4.7.s390x.rpm bind-utils-9.8.2-0.17.rc1.el6_4.7.s390x.rpm
x86_64: bind-9.8.2-0.17.rc1.el6_4.7.x86_64.rpm bind-chroot-9.8.2-0.17.rc1.el6_4.7.x86_64.rpm bind-debuginfo-9.8.2-0.17.rc1.el6_4.7.i686.rpm bind-debuginfo-9.8.2-0.17.rc1.el6_4.7.x86_64.rpm bind-libs-9.8.2-0.17.rc1.el6_4.7.i686.rpm bind-libs-9.8.2-0.17.rc1.el6_4.7.x86_64.rpm bind-utils-9.8.2-0.17.rc1.el6_4.7.x86_64.rpm


Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2016:0078-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2016:0078.html
Issue date: 2016-01-28

Topic

Updated bind packages that fix multiple security issues are now availablefor Red Hat Enterprise Linux 6.4 and 6.5 Advanced Update Support.Red Hat Product Security has rated this update as having Important securityimpact. Common Vulnerability Scoring System (CVSS) base scores, which givedetailed severity ratings, are available for each vulnerability from theCVE links in the References section.

Topics%20covered

Topics Covered

security advisory denial of service security update update red hat bind important

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 6.4) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server AUS (v. 6.5) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 6.4) - i386, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 6.5) - i386, ppc64, s390x, x86_64

Bugs Fixed

1171912 - CVE-2014-8500 bind: delegation handling denial of service

1247361 - CVE-2015-5477 bind: TKEY query handling flaw leading to denial of service

1259087 - CVE-2015-5722 bind: malformed DNSSEC key failed assertion denial of service

1291176 - CVE-2015-8000 bind: responses with a malformed class attribute can trigger an assertion failure in db.c

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