An OpenDMARC security update has been released for Ubuntu Linux 18.04 LTS.

USN-4567-1: OpenDMARC vulnerability

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Ubuntu Security Notice USN-4567-1
October 05, 2020

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

- Ubuntu 18.04 LTS

Summary:

OpenDMARC could allow signature bypass under certain conditions.

Software Description:
- opendmarc: Open Source implementation of the DMARC specification

Details:

It was discovered that OpenDMARC is prone to a signature-bypass vulnerability
with multiple "From:" addresses. An attacker could use it to bypass spam and
abuse filters.

Update instructions:

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

Ubuntu 18.04 LTS:
libopendmarc2 1.3.2-3ubuntu0.1
opendmarc 1.3.2-3ubuntu0.1
rddmarc 1.3.2-3ubuntu0.1

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

References:
  https://usn.ubuntu.com/4567-1
CVE-2019-16378

Package Information:
  https://launchpad.net/ubuntu/+source/opendmarc/1.3.2-3ubuntu0.1