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Debian DLA-1676-1 : unbound security update

medium Nessus Plugin ID 122196

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Synopsis

The remote Debian host is missing a security update.

Description

Ralph Dolmans and Karst Koymans found a flaw in the way unbound, a validating, recursive, caching DNS resolver, validated wildcard-synthesized NSEC records.

An improperly validated wildcard NSEC record could be used to prove the non-existence (NXDOMAIN answer) of an existing wildcard record, or trick unbound into accepting a NODATA proof.

For more information please refer to the upstream advisory at https://unbound.net/downloads/CVE-2017-15105.txt.

For Debian 8 'Jessie', this problem has been fixed in version 1.4.22-3+deb8u4.

We recommend that you upgrade your unbound 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.

Solution

Upgrade the affected packages.

See Also

https://lists.debian.org/debian-lts-announce/2019/02/msg00022.html

https://packages.debian.org/source/jessie/unbound

https://nlnetlabs.nl/downloads/unbound/CVE-2017-15105.txt

Plugin Details

Severity: Medium

ID: 122196

File Name: debian_DLA-1676.nasl

Version: 1.5

Type: local

Agent: unix

Published: 2/15/2019

Updated: 6/20/2024

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

Risk Information

VPR

Risk Factor: Low

Score: 1.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2017-15105

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:unbound-anchor, p-cpe:/a:debian:debian_linux:unbound, p-cpe:/a:debian:debian_linux:python-unbound, p-cpe:/a:debian:debian_linux:unbound-host, p-cpe:/a:debian:debian_linux:libunbound-dev, cpe:/o:debian:debian_linux:8.0, p-cpe:/a:debian:debian_linux:libunbound2

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

Exploit Ease: No known exploits are available

Patch Publication Date: 2/14/2019

Vulnerability Publication Date: 1/23/2018

Reference Information

CVE: CVE-2017-15105