Debian DLA-2227-1 : bind9 security update

high Nessus Plugin ID 136983


The remote Debian host is missing a security update.


Several vulnerabilities were discovered in BIND, a DNS server implementation.


It was discovered that BIND does not sufficiently limit the number of fetches performed when processing referrals. An attacker can take advantage of this flaw to cause a denial of service (performance degradation) or use the recursing server in a reflection attack with a high amplification factor.


It was discovered that a logic error in the code which checks TSIG validity can be used to trigger an assertion failure, resulting in denial of service.

For Debian 8 'Jessie', these problems have been fixed in version 1:9.9.5.dfsg-9+deb8u19.

We recommend that you upgrade your bind9 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Upgrade the affected packages.

See Also

Plugin Details

Severity: High

ID: 136983

File Name: debian_DLA-2227.nasl

Version: 1.6

Type: local

Agent: unix

Published: 6/1/2020

Updated: 3/8/2024

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Nessus

Risk Information


Risk Factor: Medium

Score: 5.2


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


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:debian:debian_linux:bind9, p-cpe:/a:debian:debian_linux:bind9-doc, p-cpe:/a:debian:debian_linux:bind9-host, p-cpe:/a:debian:debian_linux:bind9utils, p-cpe:/a:debian:debian_linux:dnsutils, p-cpe:/a:debian:debian_linux:host, p-cpe:/a:debian:debian_linux:libbind-dev, p-cpe:/a:debian:debian_linux:libbind-export-dev, p-cpe:/a:debian:debian_linux:libbind9-90, p-cpe:/a:debian:debian_linux:libdns-export100, p-cpe:/a:debian:debian_linux:libdns-export100-udeb, p-cpe:/a:debian:debian_linux:libdns100, p-cpe:/a:debian:debian_linux:libirs-export91, p-cpe:/a:debian:debian_linux:libirs-export91-udeb, p-cpe:/a:debian:debian_linux:libisc-export95, p-cpe:/a:debian:debian_linux:libisc-export95-udeb, p-cpe:/a:debian:debian_linux:libisc95, p-cpe:/a:debian:debian_linux:libisccc90, p-cpe:/a:debian:debian_linux:libisccfg-export90, p-cpe:/a:debian:debian_linux:libisccfg-export90-udeb, p-cpe:/a:debian:debian_linux:libisccfg90, p-cpe:/a:debian:debian_linux:liblwres90, p-cpe:/a:debian:debian_linux:lwresd, cpe:/o:debian:debian_linux:8.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/30/2020

Vulnerability Publication Date: 5/19/2020

Reference Information

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