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Amazon Linux 2 : bind (ALAS-2020-1426)

high Nessus Plugin ID 136749

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Synopsis

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

Description

The version of bind installed on the remote host is prior to 9.11.4-9.P2. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2020-1426 advisory.

 An assertion failure was found in BIND, which checks the validity of messages containing TSIG resource records. This flaw allows an attacker that knows or successfully guesses the name of the TSIG key used by the server to use a specially-crafted message, potentially causing a BIND server to reach an inconsistent state or cause a denial of service. A majority of BIND servers have an internally-generated TSIG session key whose name is trivially guessable, and that key exposes the vulnerability unless specifically disabled. (CVE-2020-8617)

 A flaw was found in BIND, where it does not sufficiently limit the number of fetches that can be performed while processing a referral response. This flaw allows an attacker to cause a denial of service attack.
 The attacker can also exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor. (CVE-2020-8616)

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 bind' to update your system.

See Also

https://access.redhat.com/security/cve/CVE-2020-8616

https://access.redhat.com/security/cve/CVE-2020-8617

https://alas.aws.amazon.com/AL2/ALAS-2020-1426.html

Plugin Details

Severity: High

ID: 136749

File Name: al2_ALAS-2020-1426.nasl

Version: 1.9

Type: local

Agent: unix

Published: 5/21/2020

Updated: 12/11/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2020-8616

CVSS v3

Risk Factor: High

Base Score: 8.6

Temporal Score: 7.7

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

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

Vulnerability Information

CPE: p-cpe:/a:amazon:linux:bind-pkcs11-utils, p-cpe:/a:amazon:linux:bind-pkcs11-devel, p-cpe:/a:amazon:linux:bind-export-libs, p-cpe:/a:amazon:linux:bind-libs-lite, p-cpe:/a:amazon:linux:bind-lite-devel, p-cpe:/a:amazon:linux:bind-export-devel, p-cpe:/a:amazon:linux:bind-sdb-chroot, p-cpe:/a:amazon:linux:bind-debuginfo, p-cpe:/a:amazon:linux:bind-chroot, p-cpe:/a:amazon:linux:bind-devel, p-cpe:/a:amazon:linux:bind-pkcs11-libs, cpe:/o:amazon:linux:2, p-cpe:/a:amazon:linux:bind-sdb, p-cpe:/a:amazon:linux:bind-license, p-cpe:/a:amazon:linux:bind-utils, p-cpe:/a:amazon:linux:bind-libs, p-cpe:/a:amazon:linux:bind, p-cpe:/a:amazon:linux:bind-pkcs11

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/20/2020

Vulnerability Publication Date: 5/19/2020

Reference Information

CVE: CVE-2020-8616, CVE-2020-8617

ALAS: 2020-1426

IAVA: 2020-A-0217-S