ISC BIND Service Downgrade / Reflected DoS

Medium Nessus Plugin ID 136769

Synopsis

The remote name server is affected by Service Downgrade / Reflected DoS vulnerabilities.

Description

According to its self-reported version, the instance of ISC BIND 9 running on the remote name server is affected by performance downgrade and Reflected DoS vulnerabilities. This is due to BIND DNS not sufficiently limiting the number fetches which may be performed while processing a referral response.

An unauthenticated, remote attacker can exploit this to cause degrade the service of the recursive server or to use the affected server as a reflector in a reflection attack.

Solution

Upgrade to the ISC BIND version referenced in the vendor advisory.

See Also

https://kb.isc.org/docs/cve-2020-8616

Plugin Details

Severity: Medium

ID: 136769

File Name: bind9_CVE-2020-8616.nasl

Version: 1.3

Type: remote

Family: DNS

Published: 2020/05/22

Updated: 2020/06/26

Dependencies: 10028

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2020-8616

CVSS v2.0

Base Score: 5

Temporal Score: 3.7

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

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

CVSS v3.0

Base Score: 8.6

Temporal Score: 7.5

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: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: 2020/05/19

Vulnerability Publication Date: 2020/05/19

Reference Information

CVE: CVE-2020-8616

IAVA: 2020-A-0217-S