RHEL 6 : ntp (RHSA-2015:2520)

high Nessus Plugin ID 87101

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.

Solution

Update the affected packages.

See Also

https://access.redhat.com/errata/RHSA-2015:2520

https://access.redhat.com/security/cve/cve-2015-7704

Plugin Details

Severity: High

ID: 87101

File Name: redhat-RHSA-2015-2520.nasl

Version: 2.16

Type: local

Agent: unix

Published: 11/30/2015

Updated: 10/24/2019

Supported Sensors: Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:ntp, p-cpe:/a:redhat:enterprise_linux:ntp-debuginfo, p-cpe:/a:redhat:enterprise_linux:ntp-doc, p-cpe:/a:redhat:enterprise_linux:ntp-perl, p-cpe:/a:redhat:enterprise_linux:ntpdate, cpe:/o:redhat:enterprise_linux:6.5, cpe:/o:redhat:enterprise_linux:6.6

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 11/26/2015

Vulnerability Publication Date: 8/7/2017

Reference Information

CVE: CVE-2015-7704

RHSA: 2015:2520