mutt vulnerability and regression

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

* Ubuntu 20.04 LTS
* Ubuntu 19.10
* Ubuntu 18.04 LTS
* Ubuntu 16.04 LTS
* Ubuntu 12.04 ESM

Summary

Mutt could be made to enable MITM attacks if it received a
specially crafted request.

Software Description

* mutt - text-based mailreader supporting MIME, GPG, PGP and
threading

Details

It was discovered that Mutt incorrectly handled certain requests.
An attacker could possibly use this issue to enable MITM attacks.
(CVE-2020-14954)

This update also address a regression caused in the last update
USN-4401-1. It only affected Ubuntu 12.04 ESM, Ubuntu 16.04 LTS,
Ubuntu 18.04 LTS and Ubuntu 19.10.

Update instructions

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

Ubuntu 20.04 LTS
mutt - 1.13.2-1ubuntu0.2

Ubuntu 19.10
mutt - 1.10.1-2.1ubuntu0.2

Ubuntu 18.04 LTS
mutt - 1.9.4-3ubuntu0.3

Ubuntu 16.04 LTS
mutt - 1.5.24-1ubuntu0.4

Ubuntu 12.04 ESM
mutt - 1.5.21-5ubuntu2.5

To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to restart mutt to make
all the necessary changes.

References

* CVE-2020-14954
* LP: 1884588

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