Amazon Linux AMI : ntp (ALAS-2017-816)

high Nessus Plugin ID 99529

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Synopsis

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

Description

Denial of Service via Malformed Config :

A vulnerability was discovered in the NTP server's parsing of configuration directives. A remote, authenticated attacker could cause ntpd to crash by sending a crafted message.(CVE-2017-6464)

Potential Overflows in ctl_put() functions :

A vulnerability was found in NTP, in the building of response packets with custom fields. If custom fields were configured in ntp.conf with particularly long names, inclusion of these fields in the response packet could cause a buffer overflow, leading to a crash.
(CVE-2017-6458)

Improper use of snprintf() in mx4200_send() :

A vulnerability was found in NTP, in the legacy MX4200 refclock implementation. If this refclock was compiled in and used, an attacker may be able to induce stack overflow, leading to a crash or potential code execution.(CVE-2017-6451)

Authenticated DoS via Malicious Config Option :

A vulnerability was discovered in the NTP server's parsing of configuration directives. A remote, authenticated attacker could cause ntpd to crash by sending a crafted message.(CVE-2017-6463)

Buffer Overflow in DPTS Clock :

A vulnerability was found in NTP, in the parsing of packets from the /dev/datum device. A malicious device could send crafted messages, causing ntpd to crash.(CVE-2017-6462)

Solution

Run 'yum update ntp' to update your system.

Plugin Details

Severity: High

ID: 99529

File Name: ala_ALAS-2017-816.nasl

Version: 3.6

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 4/21/2017

Updated: 4/18/2018

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.5

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

CVSS v3

Risk Factor: High

Base Score: 8.8

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

Vulnerability Information

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

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

Patch Publication Date: 4/20/2017

Reference Information

CVE: CVE-2017-6451, CVE-2017-6458, CVE-2017-6462, CVE-2017-6463, CVE-2017-6464

ALAS: 2017-816

Detections

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