=========================================================================Ubuntu Security Notice USN-4354-1
May 11, 2020

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Mailman could be made to inject arbitrary content in the login page
if it received a specially crafted input.

Software Description:
- mailman: Web-based mailing list manager (legacy branch)

Details:

It was discovered that Mailman incorrectly handled certain inputs.
An attacker could possibly use this issue to inject arbitrary content
in the login page.

Update instructions:

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

Ubuntu 18.04 LTS:
  mailman                         1:2.1.26-1ubuntu0.2

Ubuntu 16.04 LTS:
  mailman                         1:2.1.20-1ubuntu0.5

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

References:
  https://ubuntu.com/security/notices/USN-4354-1
  CVE-2020-12108

Package Information:
  https://launchpad.net/ubuntu/+source/mailman/1:2.1.26-1ubuntu0.2
  https://launchpad.net/ubuntu/+source/mailman/1:2.1.20-1ubuntu0.5