Important CentOS ntp Security Update


ntp-4.2.6p5-22.el7.centos.1.src.rpm, ntp-4.2.6p5-22.el7.centos.1.x86_64.rpm, ntp-4.2.6p5-5.el6.centos.4.i686.rpm, ntp-4.2.6p5-5.el6.centos.4.src.rpm, ntp-4.2.6p5-5.el6.centos.4.x86_64.rpm, ntp-doc-4.2.6p5-22.el7.centos.1.noarch.rpm, ntp-doc-4.2.6p5-5.el6.centos.4.noarch.rpm, ntp-perl-4.2.6p5-22.el7.centos.1.noarch.rpm, ntp-perl-4.2.6p5-5.el6.centos.4.i686.rpm, ntp-perl-4.2.6p5-5.el6.centos.4.x86_64.rpm, ntpdate-4.2.6p5-22.el7.centos.1.x86_64.rpm, ntpdate-4.2.6p5-5.el6.centos.4.i686.rpm, ntpdate-4.2.6p5-5.el6.centos.4.x86_64.rpm, sntp-4.2.6p5-22.el7.centos.1.x86_64.rpm,,
2018-01-18 11:11
2017-07-27 19:10
2017-04-01 19:09
2017-01-05 20:13


Updated ntp packages that fix one security issue are now available for Red
Hat Enterprise Linux 6 and 7.

Red Hat Product Security has rated this update as having Important 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 Network Time Protocol (NTP) is used to synchronize a computer's time
with a referenced time source.

It was discovered that ntpd as a client did not correctly check the
originate timestamp in received packets. A remote attacker could use this
flaw to send a crafted packet to an ntpd client that would effectively
disable synchronization with the server, or push arbitrary offset/delay
measurements to modify the time on the client. (CVE-2015-8138)

All ntp users are advised to upgrade to these updated packages, which
contain a backported patch to resolve this issue. After installing the
update, the ntpd daemon will restart automatically.
Please see

Am I vulnerable?

The constraints below list the versions that this vulnerability is patched in, and versions that are unaffected. If a patch is ready but unrealeased, then it is pending.

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Affected package information

Release Package Patched in
6 ntp ntp-4.2.6p5-5.el6.centos.4.src.rpm
ntp ntp-4.2.6p5-5.el6.centos.4.x86_64.rpm
ntp ntp-4.2.6p5-5.el6.centos.4.i686.rpm
ntpdate ntpdate-4.2.6p5-5.el6.centos.4.x86_64.rpm
ntpdate ntpdate-4.2.6p5-5.el6.centos.4.i686.rpm
ntp-doc ntp-doc-4.2.6p5-5.el6.centos.4.noarch.rpm
ntp-perl ntp-perl-4.2.6p5-5.el6.centos.4.i686.rpm
ntp-perl ntp-perl-4.2.6p5-5.el6.centos.4.x86_64.rpm
7 ntp ntp-4.2.6p5-22.el7.centos.1.x86_64.rpm
ntp ntp-4.2.6p5-22.el7.centos.1.src.rpm
ntpdate ntpdate-4.2.6p5-22.el7.centos.1.x86_64.rpm
ntp-doc ntp-doc-4.2.6p5-22.el7.centos.1.noarch.rpm
ntp-perl ntp-perl-4.2.6p5-22.el7.centos.1.noarch.rpm
sntp sntp-4.2.6p5-22.el7.centos.1.x86_64.rpm