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
Source: USN-4075-1: Exim vulnerability
