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

Medium Nessus Plugin ID 136749

Synopsis

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

Description

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)

Solution

Run 'yum update bind' to update your system.

See Also

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

Plugin Details

Severity: Medium

ID: 136749

File Name: al2_ALAS-2020-1426.nasl

Version: 1.5

Type: local

Agent: unix

Published: 2020/05/21

Updated: 2020/05/29

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2020-8617

CVSS v2.0

Base Score: 5

Temporal Score: 3.9

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

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

CVSS v3.0

Base Score: 7.5

Temporal Score: 6.7

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:P/RL:O/RC:C

Vulnerability Information

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

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: 2020/05/20

Vulnerability Publication Date: 2020/05/19

Reference Information

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

ALAS: 2020-1426

IAVA: 2020-A-0217