USN-3493-1: Exim vulnerability
Ubuntu Security Notice USN-3493-1
27th November, 2017
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 17.10
- Ubuntu 17.04
Exim could be made to crash or run programs if it received specially crafted network traffic.
- exim4 - Exim is a mail transport agent
It was discovered that Exim incorrectly handled memory in the ESMTP
CHUNKING extension. A remote attacker could use this issue to cause Exim to
crash, resulting in a denial of service, or possibly execute arbitrary
code. The default compiler options for affected releases should reduce the
vulnerability to a denial of service.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 17.10:
- exim4-daemon-heavy 4.89-5ubuntu1.1
- exim4-daemon-light 4.89-5ubuntu1.1
- Ubuntu 17.04:
- exim4-daemon-heavy 4.88-5ubuntu1.2
- exim4-daemon-light 4.88-5ubuntu1.2
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.