USN-1618-1: Exim vulnerability

Ubuntu Security Notice USN-1618-1

26th October, 2012

exim4 vulnerability

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

  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.04 LTS


Exim could be made to run programs if it received specially crafted network traffic.

Software description

  • exim4 - Exim is a mail transport agent


It was discovered that Exim incorrectly handled DKIM DNS decoding. This
flaw could allow a remote attacker to execute arbitrary code.

Update instructions

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

Ubuntu 12.10:
exim4-daemon-heavy 4.80-3ubuntu1.1
exim4-daemon-custom 4.80-3ubuntu1.1
exim4-daemon-light 4.80-3ubuntu1.1
Ubuntu 12.04 LTS:
exim4-daemon-heavy 4.76-3ubuntu3.1
exim4-daemon-custom 4.76-3ubuntu3.1
exim4-daemon-light 4.76-3ubuntu3.1
Ubuntu 11.10:
exim4-daemon-heavy 4.76-2ubuntu1.1
exim4-daemon-custom 4.76-2ubuntu1.1
exim4-daemon-light 4.76-2ubuntu1.1
Ubuntu 11.04:
exim4-daemon-heavy 4.74-1ubuntu1.3
exim4-daemon-custom 4.74-1ubuntu1.3
exim4-daemon-light 4.74-1ubuntu1.3
Ubuntu 10.04 LTS:
exim4-daemon-heavy 4.71-3ubuntu1.4
exim4-daemon-custom 4.71-3ubuntu1.4
exim4-daemon-light 4.71-3ubuntu1.4

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.