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

Medium Nessus Plugin ID 138621

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VPR Score: 5.2

Synopsis

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

Description

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)

Solution

Run 'yum update ntp' to update your system.

See Also

https://alas.aws.amazon.com/AL2/ALAS-2020-1455.html

Plugin Details

Severity: Medium

ID: 138621

File Name: al2_ALAS-2020-1455.nasl

Version: 1.2

Type: local

Agent: unix

Published: 2020/07/20

Updated: 2020/07/22

Dependencies: 12634

Risk Information

Risk Factor: Medium

VPR Score: 5.2

CVSS Score Source: CVE-2020-13817

CVSS v2.0

Base Score: 5.8

Temporal Score: 4.3

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

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

CVSS v3.0

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: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, p-cpe:/a:amazon:linux:sntp, cpe:/o:amazon:linux:2

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2020/07/17

Vulnerability Publication Date: 2020/04/17

Reference Information

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

ALAS: 2020-1455