USN-4366-1: Exim vulnerability

exim4 vulnerability

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 14.04 ESM

Summary

Exim could be made to access sensitive information or bypass
authentication if it received a specially crafted input.

Software Description

exim4 – Exim is a mail transport agent

Details

It was discovered that Exim incorrectly handled certain inputs.
An remote attacker could possibly use this issue to access sensitive
information or authentication bypass.

Update instructions

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

Ubuntu 20.04 LTS: exim4-base – 4.93-13ubuntu1.1; exim4-daemon-heavy – 4.93-13ubuntu1.1; exim4-daemon-light – 4.93-13ubuntu1.1
Ubuntu 19.10: exim4-base – 4.92.1-1ubuntu3.1; exim4-daemon-heavy – 4.92.1-1ubuntu3.1; exim4-daemon-light – 4.92.1-1ubuntu3.1
Ubuntu 18.04 LTS: exim4-base – 4.90.1-1ubuntu1.5; exim4-daemon-heavy – 4.90.1-1ubuntu1.5; exim4-daemon-light – 4.90.1-1ubuntu1.5
Ubuntu 16.04 LTS: exim4-base – 4.86.2-2ubuntu2.6; exim4-daemon-heavy – 4.86.2-2ubuntu2.6; exim4-daemon-light – 4.86.2-2ubuntu2.6
Ubuntu 14.04 ESM: exim4-base – 4.82-3ubuntu2.4+esm2; exim4-daemon-heavy – 4.82-3ubuntu2.4+esm2; exim4-daemon-light – 4.82-3ubuntu2.4+esm2

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

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

References

CVE-2020-12783

Source: USN-4366-1: Exim vulnerability

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