Oracle Linux 9 : avahi (ELSA-2023-6707)

medium Nessus Plugin ID 185873


The remote Oracle Linux host is missing one or more security updates.


The remote Oracle Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2023-6707 advisory.

- A vulnerability was found in the avahi library. This flaw allows an unprivileged user to make a dbus call, causing the avahi daemon to crash. (CVE-2023-1981)

- A flaw was found in avahi 0.8-5. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability. (CVE-2021-3502)

- A flaw was found in avahi in versions 0.6 up to 0.8. The event used to signal the termination of the client connection on the avahi Unix socket is not correctly handled in the client_work function, allowing a local attacker to trigger an infinite loop. The highest threat from this vulnerability is to the availability of the avahi service, which becomes unresponsive after this flaw is triggered.

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


Update the affected packages.

See Also

Plugin Details

Severity: Medium

ID: 185873

File Name: oraclelinux_ELSA-2023-6707.nasl

Version: 1.0

Type: local

Agent: unix

Published: 11/16/2023

Updated: 11/16/2023

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information


Risk Factor: Medium

Score: 4.4


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


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

CVSS Score Source: CVE-2023-1981

Vulnerability Information

CPE: cpe:/a:oracle:linux:9:3:appstream_base, cpe:/a:oracle:linux:9::appstream, cpe:/a:oracle:linux:9::codeready_builder, cpe:/a:oracle:linux:9::distro_builder, cpe:/o:oracle:linux:9, cpe:/o:oracle:linux:9:3:baseos_base, cpe:/o:oracle:linux:9::baseos_latest, p-cpe:/a:oracle:linux:avahi, p-cpe:/a:oracle:linux:avahi-compat-howl, p-cpe:/a:oracle:linux:avahi-compat-howl-devel, p-cpe:/a:oracle:linux:avahi-compat-libdns_sd, p-cpe:/a:oracle:linux:avahi-compat-libdns_sd-devel, p-cpe:/a:oracle:linux:avahi-devel, p-cpe:/a:oracle:linux:avahi-glib, p-cpe:/a:oracle:linux:avahi-glib-devel, p-cpe:/a:oracle:linux:avahi-libs, p-cpe:/a:oracle:linux:avahi-tools

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/OracleLinux

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/11/2023

Vulnerability Publication Date: 5/7/2021

Reference Information

CVE: CVE-2021-3468, CVE-2021-3502, CVE-2023-1981