A Mutt security update has been released for Ubuntu Linux 12.04 ESM, 16.04 LTS, 18.04 LTS, 20.04 LTS, and 20.10.

USN-4645-1: Mutt vulnerability

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Ubuntu Security Notice USN-4645-1
November 25, 2020

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

- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 12.04 ESM

Summary:

Mutt could be made to expose sensitive information.

Software Description:
- mutt: text-based mailreader supporting MIME, GPG, PGP and threading

Details:

It was discovered that Mutt incorrectly handled certain connections.
An attacker could possibly use this issue to expose sensitive information.

Update instructions:

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

Ubuntu 20.10:
mutt 1.14.6-1ubuntu0.1

Ubuntu 20.04 LTS:
mutt 1.13.2-1ubuntu0.3

Ubuntu 18.04 LTS:
mutt 1.9.4-3ubuntu0.4

Ubuntu 16.04 LTS:
mutt 1.5.24-1ubuntu0.5

Ubuntu 12.04 ESM:
mutt 1.5.21-5ubuntu2.6

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

References:
  https://usn.ubuntu.com/4645-1
CVE-2020-28896

Package Information:
  https://launchpad.net/ubuntu/+source/mutt/1.14.6-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/mutt/1.13.2-1ubuntu0.3
  https://launchpad.net/ubuntu/+source/mutt/1.9.4-3ubuntu0.4
  https://launchpad.net/ubuntu/+source/mutt/1.5.24-1ubuntu0.5