Low CentOS unbound Security Update


unbound-1.4.20-26.el7.x86_64.rpm, unbound-devel-1.4.20-26.el7.i686.rpm, unbound-devel-1.4.20-26.el7.x86_64.rpm, unbound-libs-1.4.20-26.el7.i686.rpm, unbound-libs-1.4.20-26.el7.x86_64.rpm, unbound-python-1.4.20-26.el7.x86_64.rpm
rhn.redhat.com, lists.centos.org
2018-01-18 11:11
2017-07-27 19:10
2017-04-01 19:09
2017-01-05 20:13


Updated unbound packages that fix one security issue and several bugs are
now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having Low security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

The unbound packages provide a validating, recursive, and caching DNS or
DNSSEC resolver.

A denial of service flaw was found in unbound that an attacker could use to
trick the unbound resolver into following an endless loop of delegations,
consuming an excessive amount of resources. (CVE-2014-8602)

This update also fixes the following bugs:

* Prior to this update, there was a mistake in the time configuration in
the cron job invoking unbound-anchor to update the root zone key.
Consequently, unbound-anchor was invoked once a month instead of every day,
thus not complying with RFC 5011. The cron job has been replaced with a
systemd timer unit that is invoked on a daily basis. Now, the root zone key
validity is checked daily at a random time within a 24-hour window, and
compliance with RFC 5011 is ensured. (BZ#1180267)

* Previously, the unbound packages were installing their configuration file
for the systemd-tmpfiles utility into the /etc/tmpfiles.d/ directory. As a
consequence, changes to unbound made by the administrator in
/etc/tmpfiles.d/ could be overwritten on package reinstallation or update.
To fix this bug, unbound has been amended to install the configuration file
into the /usr/lib/tmpfiles.d/ directory. As a result, the system
administrator's configuration in /etc/tmpfiles.d/ is preserved, including
any changes, on package reinstallation or update. (BZ#1180995)

* The unbound server default configuration included validation of DNS
records using the DNSSEC Look-aside Validation (DLV) registry. The Internet
Systems Consortium (ISC) plans to deprecate the DLV registry service as no
longer needed, and unbound could execute unnecessary steps. Therefore, the
use of the DLV registry has been removed from the unbound server default
configuration. Now, unbound does not try to perform DNS records validation
using the DLV registry. (BZ#1223339)

All unbound users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.
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Affected package information

Release Package Patched in
7 unbound unbound-1.4.20-26.el7.x86_64.rpm
unbound-devel unbound-devel-1.4.20-26.el7.i686.rpm
unbound-devel unbound-devel-1.4.20-26.el7.x86_64.rpm
unbound-libs unbound-libs-1.4.20-26.el7.i686.rpm
unbound-libs unbound-libs-1.4.20-26.el7.x86_64.rpm
unbound-python unbound-python-1.4.20-26.el7.x86_64.rpm