USN-4124-1: Exim vulnerability
6 September 2019
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
It was discovered that Exim incorrectly handled certain decoding operations. A remote attacker could possibly use this issue to execute arbitrary commands.
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 19.04
- exim4-daemon-heavy - 4.92-4ubuntu1.3
- exim4-daemon-light - 4.92-4ubuntu1.3
- Ubuntu 18.04 LTS
- exim4-daemon-heavy - 4.90.1-1ubuntu1.4
- exim4-daemon-light - 4.90.1-1ubuntu1.4
- Ubuntu 16.04 LTS
- exim4-daemon-heavy - 4.86.2-2ubuntu2.5
- exim4-daemon-light - 4.86.2-2ubuntu2.5
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.