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

high Nessus Plugin ID 137092

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Synopsis

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

Description

The version of bind installed on the remote host is prior to 9.8.2-0.68.rc1.64. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2020-1369 advisory.

 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)

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/ALAS-2020-1369.html

Plugin Details

Severity: High

ID: 137092

File Name: ala_ALAS-2020-1369.nasl

Version: 1.6

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

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: 6/3/2020

Vulnerability Publication Date: 5/19/2020

Reference Information

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

ALAS: 2020-1369