An Open vSwitch security update has been released for Ubuntu Linux 18.04 LTS and 20.04 LTS.

[USN-6514-1] Open vSwitch vulnerability

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Ubuntu Security Notice USN-6514-1
November 26, 2023

openvswitch vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)

Summary:

Open vSwitch could be made to expose sensitive information over the
network.

Software Description:
- openvswitch: Ethernet virtual switch

Details:

It was discovered that Open vSwitch did not correctly handle OpenFlow
rules for ICMPv6 Neighbour Advertisement packets. A local attacker could
possibly use this issue to redirect traffic to arbitrary IP addresses.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS:
openvswitch-common 2.13.8-0ubuntu1.3

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
openvswitch-common 2.9.8-0ubuntu0.18.04.5+esm1

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6514-1
CVE-2023-5366

Package Information:
https://launchpad.net/ubuntu/+source/openvswitch/2.13.8-0ubuntu1.3