Debian DSA-4689-1 : bind9 - security update

Medium Nessus Plugin ID 136721

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VPR Score: 6.1

Synopsis

The remote Debian host is missing a security-related update.

Description

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

- CVE-2019-6477 It was discovered that TCP-pipelined queries can bypass tcp-client limits resulting in denial of service.

- CVE-2020-8616 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.

- CVE-2020-8617 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.

Solution

Upgrade the bind9 packages.

For the oldstable distribution (stretch), these problems have been fixed in version 1:9.10.3.dfsg.P4-12.3+deb9u6.

For the stable distribution (buster), these problems have been fixed in version 1:9.11.5.P4+dfsg-5.1+deb10u1.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=945171

https://security-tracker.debian.org/tracker/CVE-2019-6477

https://security-tracker.debian.org/tracker/CVE-2020-8616

https://security-tracker.debian.org/tracker/CVE-2020-8617

https://security-tracker.debian.org/tracker/source-package/bind9

https://packages.debian.org/source/stretch/bind9

https://packages.debian.org/source/buster/bind9

https://www.debian.org/security/2020/dsa-4689

Plugin Details

Severity: Medium

ID: 136721

File Name: debian_DSA-4689.nasl

Version: 1.6

Type: local

Agent: unix

Published: 2020/05/20

Updated: 2020/06/26

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, cpe:/o:debian:debian_linux:10.0, cpe:/o:debian:debian_linux:9.0

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: 2020/05/19

Vulnerability Publication Date: 2019/11/26

Reference Information

CVE: CVE-2019-6477, CVE-2020-8616, CVE-2020-8617

DSA: 4689

IAVA: 2020-A-0217-S