USN-3565-1: Exim vulnerability

Ubuntu Security Notice USN-3565-1

12th February, 2018

exim4 vulnerability

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

Ubuntu 17.10
Ubuntu 16.04 LTS
Ubuntu 14.04 LTS

Summary

Exim could be made to crash or run programs if it received specially
crafted network traffic.

Software description

exim4
– Exim is a mail transport agent

Details

Meh Chang discovered that Exim incorrectly handled memory in certain
decoding operations. A remote attacker could use this issue to cause Exim
to crash, resulting in a denial of service, or possibly execute arbitrary
code.

Update instructions

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

Ubuntu 17.10:: exim4-daemon-heavy

4.89-5ubuntu1.3; exim4-daemon-light

4.89-5ubuntu1.3
Ubuntu 16.04 LTS:: exim4-daemon-heavy

4.86.2-2ubuntu2.3; exim4-daemon-light

4.86.2-2ubuntu2.3
Ubuntu 14.04 LTS:: exim4-daemon-heavy

4.82-3ubuntu2.4; exim4-daemon-light

4.82-3ubuntu2.4

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-2018-6789

Source: USN-3565-1: Exim vulnerability

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