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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

The version of unbound installed on the remote host is prior to 1.6.6-1.5. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2020-1373 advisory.

 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)

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 unbound' to update your system.

See Also

https://access.redhat.com/security/cve/CVE-2020-12662

https://access.redhat.com/security/cve/CVE-2020-12663

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

Plugin Details

Severity: High

ID: 137096

File Name: ala_ALAS-2020-1373.nasl

Version: 1.4

Type: local

Agent: unix

Published: 6/4/2020

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: 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-libs, p-cpe:/a:amazon:linux:unbound-debuginfo, cpe:/o:amazon:linux, p-cpe:/a:amazon:linux:unbound

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