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USN-4567-1: OpenDMARC vulnerability

5 October 2020

OpenDMARC could allow signature bypass under certain conditions.



  • opendmarc - Open Source implementation of the DMARC specification


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

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