RHEL 6 : ntp (RHSA-2015:2520)

Medium Nessus Plugin ID 87101

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VPR Score: 4.4

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: Medium

ID: 87101

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

Version: 2.16

Type: local

Agent: unix

Published: 2015/11/30

Updated: 2019/10/24

Dependencies: 12634

Risk Information

Risk Factor: Medium

VPR Score: 4.4

CVSS v2.0

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

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: CVSS:3.0/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 Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/11/26

Vulnerability Publication Date: 2017/08/07

Reference Information

CVE: CVE-2015-7704

RHSA: 2015:2520