Debian DLA-2227-1 : bind9 security update

Medium Nessus Plugin ID 136983

New! Vulnerability Priority Rating (VPR)

Tenable calculates a dynamic VPR for every vulnerability. VPR combines vulnerability information with threat intelligence and machine learning algorithms to predict which vulnerabilities are most likely to be exploited in attacks. Read more about what VPR is and how it's different from CVSS.

VPR Score: 6.1


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: Medium

ID: 136983

File Name: debian_DLA-2227.nasl

Version: 1.5

Type: local

Agent: unix

Published: 2020/06/01

Updated: 2021/01/11

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: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: 2020/05/30

Vulnerability Publication Date: 2020/05/19

Reference Information

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