Oracle Linux 6 / 7 : ntp (ELSA-2017-0252)

This script is Copyright (C) 2017 Tenable Network Security, Inc.

Synopsis :

The remote Oracle Linux host is missing one or more security updates.

Description :

From Red Hat Security Advisory 2017:0252 :

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 is configured with rate limiting for all
associations the limits are also applied to responses received from
its configured sources. A remote attacker who knows the sources can
cause a denial of service by preventing ntpd from accepting valid
responses from its sources. (CVE-2016-7426)

* A flaw was found in the control mode functionality of ntpd. A remote
attacker could send a crafted control mode packet which could lead to
information disclosure or result in DDoS amplification attacks.

* A flaw was found in the way ntpd implemented the trap service. A
remote attacker could send a specially crafted packet to cause a NULL
pointer dereference that will crash ntpd, resulting in a denial of
service. (CVE-2016-9311)

* A flaw was found in the way ntpd running on a host with multiple
network interfaces handled certain server responses. A remote attacker
could use this flaw which would cause ntpd to not synchronize with the
source. (CVE-2016-7429)

* A flaw was found in the way ntpd calculated the root delay. A remote
attacker could send a specially crafted spoofed packet to cause denial
of service or in some special cases even crash. (CVE-2016-7433)

See also :

Solution :

Update the affected ntp packages. However, note that updated packages
may not be available from the Oracle repository or its mirrors at this

Risk factor :

High / CVSS Base Score : 7.1

Family: Oracle Linux Local Security Checks

Nessus Plugin ID: 97036 ()

Bugtraq ID:

CVE ID: CVE-2016-7426

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