Amazon Linux AMI : ntp (ALAS-2016-708)

high Nessus Plugin ID 91467
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Amazon Linux AMI host is missing a security update.

Description

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)

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)

A flaw was found in the way 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)

Assertion failure in ntpd on duplicate IPs on unconfig directives (CVE-2016-2516)

Solution

Run 'yum update ntp' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2016-708.html

Plugin Details

Severity: High

ID: 91467

File Name: ala_ALAS-2016-708.nasl

Version: 2.7

Type: local

Agent: unix

Published: 6/6/2016

Updated: 4/18/2018

Dependencies: ssh_get_info.nasl

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.1

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

CVSS v3

Risk Factor: High

Base Score: 7.2

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

Vulnerability Information

CPE: cpe:2.3:o:amazon:linux:*:*:*:*:*:*:*:*, p-cpe:2.3:a:amazon:linux:ntp:*:*:*:*:*:*:*, p-cpe:2.3:a:amazon:linux:ntp-debuginfo:*:*:*:*:*:*:*, p-cpe:2.3:a:amazon:linux:ntp-doc:*:*:*:*:*:*:*, p-cpe:2.3:a:amazon:linux:ntp-perl:*:*:*:*:*:*:*, p-cpe:2.3:a:amazon:linux:ntpdate:*:*:*:*:*:*:*

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

Patch Publication Date: 6/2/2016

Reference Information

CVE: CVE-2016-1548, CVE-2016-1550, CVE-2016-2516, CVE-2016-2518

ALAS: 2016-708