Amazon Linux 2 : ntp (ALAS-2020-1455)

high Nessus Plugin ID 138621

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Synopsis

The remote Amazon Linux 2 host is missing a security update.

Description

The version of ntp installed on the remote host is prior to 4.2.6p5-29. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1455 advisory.

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (daemon exit or system time change) by predicting transmit timestamps for use in spoofed packets. The victim must be relying on unauthenticated IPv4 time sources. There must be an off-path attacker who can query time from the victim's ntpd instance. (CVE-2020-13817)

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronization via a server mode packet with a spoofed source IP address, because transmissions are rescheduled even when a packet lacks a valid origin timestamp. (CVE-2020-11868)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Run 'yum update ntp' to update your system.

Plugin Details

Severity: High

ID: 138621

File Name: al2_ALAS-2020-1455.nasl

Version: 1.3

Type: local

Agent: unix

Family: Amazon Linux Local Security Checks

Published: 7/20/2020

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.3

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

CVSS Score Source: CVE-2020-13817

CVSS v3

Risk Factor: High

Base Score: 7.4

Temporal Score: 6.4

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:sntp, p-cpe:/a:amazon:linux:ntpdate, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:ntp, p-cpe:/a:amazon:linux:ntp-debuginfo, p-cpe:/a:amazon:linux:ntp-perl, p-cpe:/a:amazon:linux:ntp-doc

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

Exploit Ease: No known exploits are available

Patch Publication Date: 7/17/2020

Vulnerability Publication Date: 4/17/2020

Reference Information

CVE: CVE-2020-11868, CVE-2020-13817

ALAS: 2020-1455

Detections

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