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Debian DLA-2738-1 : c-ares - LTS security update

medium Nessus Plugin ID 152486

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Synopsis

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

Description

The remote Debian 9 host has packages installed that are affected by a vulnerability as referenced in the dla-2738 advisory.

 An issue has been found in c-ares, an asynchronous name resolver. Missing input validation of host names returned by Domain Name Servers can lead to output of wrong hostnames. For Debian 9 stretch, this problem has been fixed in version 1.12.0-1+deb9u2. We recommend that you upgrade your c-ares packages. For the detailed security status of c-ares please refer to its security tracker page at: https://security- tracker.debian.org/tracker/c-ares Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the c-ares packages.

For Debian 9 stretch, this problem has been fixed in version 1.12.0-1+deb9u2.

See Also

https://security-tracker.debian.org/tracker/source-package/c-ares

https://www.debian.org/lts/security/2021/dla-2738

https://security-tracker.debian.org/tracker/CVE-2021-3672

https://packages.debian.org/source/stretch/c-ares

Plugin Details

Severity: Medium

ID: 152486

File Name: debian_DLA-2738.nasl

Version: 1.6

Type: local

Agent: unix

Published: 8/11/2021

Updated: 1/24/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.2

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

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

CVSS Score Source: CVE-2021-3672

CVSS v3

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 5.1

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:9.0, p-cpe:/a:debian:debian_linux:libc-ares-dev, p-cpe:/a:debian:debian_linux:libc-ares2

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: 8/10/2021

Vulnerability Publication Date: 8/10/2021

Reference Information

CVE: CVE-2021-3672