USN-4075-1: Exim vulnerability

exim4 vulnerability

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

Ubuntu 19.04
Ubuntu 18.04 LTS
Ubuntu 16.04 LTS

Summary

Exim could be made to run programs as an administrator if it received
specially crafted network traffic.

Software Description

exim4 – Exim is a mail transport agent

Details

Jeremy Harris discovered that Exim incorrectly handled sort expansions. In
environments where sort expansions are used, a remote attacker could
possibly use this issue to execute arbitrary code as root.

Update instructions

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

Ubuntu 19.04: exim4-daemon-heavy – 4.92-4ubuntu1.2; exim4-daemon-light – 4.92-4ubuntu1.2
Ubuntu 18.04 LTS: exim4-daemon-heavy – 4.90.1-1ubuntu1.3; exim4-daemon-light – 4.90.1-1ubuntu1.3
Ubuntu 16.04 LTS: exim4-daemon-heavy – 4.86.2-2ubuntu2.4; exim4-daemon-light – 4.86.2-2ubuntu2.4

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-2019-13917

Source: USN-4075-1: Exim vulnerability

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