Debian DSA-4909-1 : bind9 - security update

critical Nessus Plugin ID 149229
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

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

Description

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

- CVE-2021-25214 Greg Kuechle discovered that a malformed incoming IXFR transfer could trigger an assertion failure in named, resulting in denial of service.

- CVE-2021-25215 Siva Kakarla discovered that named could crash when a DNAME record placed in the ANSWER section during DNAME chasing turned out to be the final answer to a client query.

- CVE-2021-25216 It was discovered that the SPNEGO implementation used by BIND is prone to a buffer overflow vulnerability. This update switches to use the SPNEGO implementation from the Kerberos libraries.

Solution

Upgrade the bind9 packages.

For the stable distribution (buster), these problems have been fixed in version 1:9.11.5.P4+dfsg-5.1+deb10u5.

See Also

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987741

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987742

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=987743

https://security-tracker.debian.org/tracker/CVE-2021-25214

https://security-tracker.debian.org/tracker/CVE-2021-25215

https://security-tracker.debian.org/tracker/CVE-2021-25216

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

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

https://www.debian.org/security/2021/dsa-4909

Plugin Details

Severity: Critical

ID: 149229

File Name: debian_DSA-4909.nasl

Version: 1.4

Type: local

Agent: unix

Published: 5/3/2021

Updated: 5/14/2021

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2021-25216

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

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

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:bind9, cpe:/o:debian:debian_linux:10.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/1/2021

Vulnerability Publication Date: 4/29/2021

Reference Information

CVE: CVE-2021-25214, CVE-2021-25215, CVE-2021-25216

DSA: 4909