RHEL 6 : ntp (RHSA-2015:2520)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated ntp packages that fix one security issue are now available for
Red Hat Enterprise Linux 6.5 and 6.6 Extended Update Support.

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
timestamps in Kiss-of-Death packets. A remote attacker could use this
flaw to send a crafted Kiss-of-Death packet to an ntpd client that
would increase the client's polling interval value, and effectively
disable synchronization with the server. (CVE-2015-7704)

Red Hat would like to thank Aanchal Malhotra, Isaac E. Cohen, and
Sharon Goldberg of Boston University for reporting this issue.

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.

See also :

https://www.redhat.com/security/data/cve/CVE-2015-7704.html
http://rhn.redhat.com/errata/RHSA-2015-2520.html

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P)
CVSS Temporal Score : 4.1
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 87101 ()

Bugtraq ID:

CVE ID: CVE-2015-7704

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