Amazon Linux AMI : bind (ALAS-2020-1369)

Medium Nessus Plugin ID 137092

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VPR Score: 6.1

Synopsis

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

Description

A malicious actor who intentionally exploits this lack of effective limitation on the number of fetches performed when processing referrals can, through the use of specially crafted referrals, cause a recursing server to issue a very large number of fetches in an attempt to process the referral. This has at least two potential effects: The performance of the recursing server can potentially be degraded by the additional work required to perform these fetches, and The attacker can exploit this behavior to use the recursing server as a reflector in a reflection attack with a high amplification factor.(CVE-2020-8616)

Using a specially crafted message, an attacker may potentially cause a BIND server to reach an inconsistent state if the attacker knows (or successfully guesses) the name of a TSIG key used by the server. Since BIND, by default, configures a local session key even on servers whose configuration does not otherwise make use of it, almost all current BIND servers are vulnerable. In releases of BIND dating from March 2018 and after, an assertion check in tsig.c detects this inconsistent state and deliberately exits. Prior to the introduction of the check the server would continue operating in an inconsistent state, with potentially harmful results.(CVE-2020-8617)

Solution

Run 'yum update bind' to update your system.

See Also

https://alas.aws.amazon.com/ALAS-2020-1369.html

Plugin Details

Severity: Medium

ID: 137092

File Name: ala_ALAS-2020-1369.nasl

Version: 1.3

Type: local

Agent: unix

Published: 2020/06/04

Updated: 2020/08/13

Dependencies: 12634

Risk Information

Risk Factor: Medium

VPR Score: 6.1

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-libs, p-cpe:/a:amazon:linux:bind-sdb, p-cpe:/a:amazon:linux:bind-utils, cpe:/o:amazon:linux

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: 2020/06/03

Vulnerability Publication Date: 2020/05/19

Reference Information

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

ALAS: 2020-1369