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Ubuntu 18.04 LTS / 20.04 LTS : Avahi vulnerabilities (USN-5008-1)

medium Nessus Plugin ID 151452

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-5008-1 advisory.

 Thomas Kremer discovered that Avahi incorrectly handled termination signals on the Unix socket. A local attacker could possibly use this issue to cause Avahi to hang, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2021-3468)

 It was discovered that Avahi incorrectly handled certain hostnames. A local attacker could possibly use this issue to cause Avahi to crash, resulting in a denial of service. This issue only affected Ubuntu 20.10 and Ubuntu 21.04. (CVE-2021-3502)

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

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

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-5008-1

Plugin Details

Severity: Medium

ID: 151452

File Name: ubuntu_USN-5008-1.nasl

Version: 1.5

Type: local

Agent: unix

Published: 7/8/2021

Updated: 8/27/2024

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

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

CVSS Score Source: CVE-2021-3502

CVSS v3

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 5

Vector: CVSS:3.0/AV:L/AC:L/PR:L/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:canonical:ubuntu_linux:avahi-dnsconfd, p-cpe:/a:canonical:ubuntu_linux:libavahi-common3, p-cpe:/a:canonical:ubuntu_linux:libavahi-gobject0, p-cpe:/a:canonical:ubuntu_linux:libavahi-common3-udeb, p-cpe:/a:canonical:ubuntu_linux:avahi-ui-utils, p-cpe:/a:canonical:ubuntu_linux:libavahi-common-data, p-cpe:/a:canonical:ubuntu_linux:libavahi-ui-gtk3-dev, p-cpe:/a:canonical:ubuntu_linux:libavahi-client3, cpe:/o:canonical:ubuntu_linux:20.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:libavahi-gobject-dev, p-cpe:/a:canonical:ubuntu_linux:libavahi-core7, p-cpe:/a:canonical:ubuntu_linux:libavahi-glib-dev, p-cpe:/a:canonical:ubuntu_linux:avahi-discover, p-cpe:/a:canonical:ubuntu_linux:python-avahi, p-cpe:/a:canonical:ubuntu_linux:libavahi-ui-gtk3-0, p-cpe:/a:canonical:ubuntu_linux:libavahi-core7-udeb, p-cpe:/a:canonical:ubuntu_linux:avahi-daemon, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:avahi-utils, p-cpe:/a:canonical:ubuntu_linux:avahi-autoipd, p-cpe:/a:canonical:ubuntu_linux:libavahi-core-dev, p-cpe:/a:canonical:ubuntu_linux:gir1.2-avahi-0.6, p-cpe:/a:canonical:ubuntu_linux:libavahi-compat-libdnssd1, p-cpe:/a:canonical:ubuntu_linux:libavahi-compat-libdnssd-dev, p-cpe:/a:canonical:ubuntu_linux:libavahi-glib1, p-cpe:/a:canonical:ubuntu_linux:libavahi-common-dev, p-cpe:/a:canonical:ubuntu_linux:libavahi-client-dev

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/7/2021

Vulnerability Publication Date: 5/7/2021

Reference Information

CVE: CVE-2021-3468, CVE-2021-3502

USN: 5008-1