ISC BIND 9.15.6 < 9.16.6 / 9.17.x < 9.17.4 DoS

high Nessus Plugin ID 139921

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Synopsis

The remote name server is affected by a denial of service vulnerability.

Description

According to its self-reported version number, the installation of ISC BIND running on the remote name server is version 9.15.6 prior to 9.16.6 or 9.17.x prior to 9.17.4. It is, therefore, affected by a denial of service (DoS) vulnerability due to an incorrectly specified maximum buffer size. An unauthenticated, remote attacker can exploit this issue by sending a specially crafted large TCP payload to trigger an assertion failure, causing the server to exit.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to BIND 9.16.6, 9.17.4 or later.

See Also

https://kb.isc.org/docs/cve-2020-8620

Plugin Details

Severity: High

ID: 139921

File Name: bind9_9174_cve-2020-8620.nasl

Version: 1.3

Type: remote

Family: DNS

Published: 8/28/2020

Updated: 6/3/2021

Risk Information

CVSS Score Source: CVE-2020-8620

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

Temporal Vector: E:U/RL:OF/RC:C

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: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:isc:bind

Required KB Items: bind/version

Exploit Ease: No known exploits are available

Patch Publication Date: 8/20/2020

Vulnerability Publication Date: 8/20/2020

Reference Information

CVE: CVE-2020-8620

IAVA: 2020-A-0385-S