USN-3322-1: Exim vulnerability

19 June 2017

exim4 vulnerability

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

  • Ubuntu 17.04
  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS

Summary

Exim could be made to run programs as an administrator.

Software Description

  • exim4 - Exim is a mail transport agent

Details

It was discovered that Exim did not properly deallocate memory when processing certain command line arguments. A local attacker could use this in conjunction with a vulnerability in the underlying kernel to possibly execute arbitrary code and gain administrative privileges.

Update instructions

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

Ubuntu 17.04
exim4-daemon-heavy - 4.88-5ubuntu1.1
exim4-daemon-light - 4.88-5ubuntu1.1
Ubuntu 16.10
exim4-daemon-heavy - 4.87-3ubuntu1.2
exim4-daemon-light - 4.87-3ubuntu1.2
Ubuntu 16.04 LTS
exim4-daemon-heavy - 4.86.2-2ubuntu2.2
exim4-daemon-light - 4.86.2-2ubuntu2.2
Ubuntu 14.04 LTS
exim4-daemon-heavy - 4.82-3ubuntu2.3
exim4-daemon-light - 4.82-3ubuntu2.3

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