Debian DSA-4983-1 : neutron - security update

critical Nessus Plugin ID 153993

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Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 10 / 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-4983 advisory.

- A flaw was found in openstack-neutron's default Open vSwitch firewall rules. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the IPv6 addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. Only deployments using the Open vSwitch driver are affected. Source: OpenStack project. Versions before openstack-neutron 15.3.3, openstack-neutron 16.3.1 and openstack-neutron 17.1.1 are affected. (CVE-2021-20267)

- OpenStack Neutron before 16.4.1, 17.x before 17.1.3, and 18.0.0 allows hardware address impersonation when the linuxbridge driver with ebtables-nft is used on a Netfilter-based platform. By sending carefully crafted packets, anyone in control of a server instance connected to the virtual switch can impersonate the hardware addresses of other systems on the network, resulting in denial of service or in some cases possibly interception of traffic intended for other destinations. (CVE-2021-38598)

- An issue was discovered in OpenStack Neutron before 16.4.1, 17.x before 17.2.1, and 18.x before 18.1.1.
Authenticated attackers can reconfigure dnsmasq via a crafted extra_dhcp_opts value. (CVE-2021-40085)

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 neutron packages.

For the stable distribution (bullseye), this problem has been fixed in version 2

Plugin Details

Severity: Critical

ID: 153993

File Name: debian_DSA-4983.nasl

Version: 1.3

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 10/11/2021

Updated: 11/28/2023

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.5

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

CVSS Score Source: CVE-2021-38598

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 8.2

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

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

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:neutron-api, p-cpe:/a:debian:debian_linux:neutron-ovn-metadata-agent, p-cpe:/a:debian:debian_linux:neutron-macvtap-agent, p-cpe:/a:debian:debian_linux:neutron-plugin-nec-agent, p-cpe:/a:debian:debian_linux:neutron-rpc-server, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:neutron-metadata-agent, cpe:/o:debian:debian_linux:10.0, p-cpe:/a:debian:debian_linux:neutron-metering-agent, p-cpe:/a:debian:debian_linux:python3-neutron, p-cpe:/a:debian:debian_linux:neutron-l3-agent, p-cpe:/a:debian:debian_linux:neutron-dhcp-agent, p-cpe:/a:debian:debian_linux:neutron-sriov-agent, p-cpe:/a:debian:debian_linux:neutron-common, p-cpe:/a:debian:debian_linux:neutron-doc, p-cpe:/a:debian:debian_linux:neutron-linuxbridge-agent, p-cpe:/a:debian:debian_linux:neutron-openvswitch-agent, p-cpe:/a:debian:debian_linux:neutron-server

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: 10/10/2021

Vulnerability Publication Date: 5/28/2021

Reference Information

CVE: CVE-2021-20267, CVE-2021-38598, CVE-2021-40085

Detections

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