Moderate CentOS ntp Security Update

Metadata

medium
6.4
ntp-4.2.6p5-10.el6.centos.1.i686.rpm, ntp-4.2.6p5-10.el6.centos.1.src.rpm, ntp-4.2.6p5-10.el6.centos.1.x86_64.rpm, ntp-4.2.6p5-22.el7.centos.2.src.rpm, ntp-4.2.6p5-22.el7.centos.2.x86_64.rpm, ntp-doc-4.2.6p5-10.el6.centos.1.noarch.rpm, ntp-doc-4.2.6p5-22.el7.centos.2.noarch.rpm, ntp-perl-4.2.6p5-10.el6.centos.1.i686.rpm, ntp-perl-4.2.6p5-10.el6.centos.1.x86_64.rpm, ntp-perl-4.2.6p5-22.el7.centos.2.noarch.rpm, ntpdate-4.2.6p5-10.el6.centos.1.i686.rpm, ntpdate-4.2.6p5-10.el6.centos.1.x86_64.rpm, ntpdate-4.2.6p5-22.el7.centos.2.x86_64.rpm, sntp-4.2.6p5-22.el7.centos.2.x86_64.rpm
CVE-2015-7979, CVE-2016-1547, CVE-2016-1548, CVE-2016-1550, CVE-2016-2518
rhn.redhat.com, lists.centos.org, lists.centos.org
2016-05-31
2017-07-27 19:11
ALAS-2016-649
ALAS-2016-708
Moderate CentOS ntp Security Update
CVE-2016-2518 ntp
CVE-2015-7979 ntp
CVE-2016-1547 ntp
CVE-2016-1548 ntp
CVE-2016-1550 ntp
CVE-2016-2518
CVE-2015-7979
CVE-2016-1548
CVE-2016-1547
CVE-2016-1550
2017-04-01 19:09
2017-01-05 20:14

Description


An update for ntp is now available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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.

The Network Time Protocol (NTP) is used to synchronize a computer's time with another referenced time source. These packages include the ntpd service which continuously adjusts system time and utilities used to query and configure the ntpd service.

Security Fix(es):

* It was found that when NTP was configured in broadcast mode, a remote attacker could broadcast packets with bad authentication to all clients. The clients, upon receiving the malformed packets, would break the association with the broadcast server, causing them to become out of sync over a longer period of time. (CVE-2015-7979)

* A denial of service flaw was found in the way NTP handled preemptable client associations. A remote attacker could send several crypto NAK packets to a victim client, each with a spoofed source address of an existing associated peer, preventing that client from synchronizing its time. (CVE-2016-1547)

* It was found that an ntpd client could be forced to change from basic client/server mode to the interleaved symmetric mode. A remote attacker could use a spoofed packet that, when processed by an ntpd client, would cause that client to reject all future legitimate server responses, effectively disabling time synchronization on that client. (CVE-2016-1548)

* A flaw was found in the way NTP's libntp performed message authentication. An attacker able to observe the timing of the comparison function used in packet authentication could potentially use this flaw to recover the message digest. (CVE-2016-1550)

* An out-of-bounds access flaw was found in the way ntpd processed certain packets. An authenticated attacker could use a crafted packet to create a peer association with hmode of 7 and larger, which could potentially (although highly unlikely) cause ntpd to crash. (CVE-2016-2518)

The CVE-2016-1548 issue was discovered by Miroslav Lichvar (Red Hat).
Please see https://www.redhat.com/footer/terms-of-use.html

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.

Or, you can just let us figure it out for you! Appcanary continously monitor your installed packages, and tell you if any of them are vulnerable.

Sign up for monitoring

Affected package information

Release Package Patched in
6 ntp ntp-4.2.6p5-10.el6.centos.1.i686.rpm
ntp ntp-4.2.6p5-10.el6.centos.1.src.rpm
ntp ntp-4.2.6p5-10.el6.centos.1.x86_64.rpm
ntpdate ntpdate-4.2.6p5-10.el6.centos.1.x86_64.rpm
ntpdate ntpdate-4.2.6p5-10.el6.centos.1.i686.rpm
ntp-doc ntp-doc-4.2.6p5-10.el6.centos.1.noarch.rpm
ntp-perl ntp-perl-4.2.6p5-10.el6.centos.1.i686.rpm
ntp-perl ntp-perl-4.2.6p5-10.el6.centos.1.x86_64.rpm
7 ntp ntp-4.2.6p5-22.el7.centos.2.x86_64.rpm
ntp ntp-4.2.6p5-22.el7.centos.2.src.rpm
ntpdate ntpdate-4.2.6p5-22.el7.centos.2.x86_64.rpm
ntp-doc ntp-doc-4.2.6p5-22.el7.centos.2.noarch.rpm
ntp-perl ntp-perl-4.2.6p5-22.el7.centos.2.noarch.rpm
sntp sntp-4.2.6p5-22.el7.centos.2.x86_64.rpm