==========================================================================
Ubuntu Security Notice USN-4075-1
July 25, 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:
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
In general, a standard system update will make all the necessary changes.
References:
https://usn.ubuntu.com/4075-1
CVE-2019-13917
Package Information:
https://launchpad.net/ubuntu/+source/exim4/4.92-4ubuntu1.2
https://launchpad.net/ubuntu/+source/exim4/4.90.1-1ubuntu1.3
https://launchpad.net/ubuntu/+source/exim4/4.86.2-2ubuntu2.4
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