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Amazon Linux AMI : unbound (ALAS-2020-1373)

high Nessus Plugin ID 137096

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Synopsis

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

Description

A network amplification vulnerability was found in Unbound, in the way it processes delegation messages from one authoritative zone to another. This flaw allows an attacker to cause a denial of service or be part of an attack against another DNS server when Unbound is deployed as a recursive resolver or authoritative name server.(CVE-2020-12662)

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.(CVE-2020-12663)

Solution

Run 'yum update unbound' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2020-1373.html

Plugin Details

Severity: High

ID: 137096

File Name: ala_ALAS-2020-1373.nasl

Version: 1.3

Type: local

Agent: unix

Published: 6/4/2020

Updated: 3/8/2024

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

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2020-12663

CVSS v3

Risk Factor: High

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:amazon:linux:unbound-python, p-cpe:/a:amazon:linux:unbound-devel, p-cpe:/a:amazon:linux:unbound, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:unbound-debuginfo, p-cpe:/a:amazon:linux:unbound-libs

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/3/2020

Vulnerability Publication Date: 5/19/2020

Reference Information

CVE: CVE-2020-12662, CVE-2020-12663

ALAS: 2020-1373