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Ubuntu: Security update for Exim

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

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1618-1
October 26, 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

Summary:

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

Software Description:
- exim4: Exim is a mail transport agent

Details:

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 versions:

Ubuntu 12.10:
 exim4-daemon-custom             4.80-3ubuntu1.1
 exim4-daemon-heavy              4.80-3ubuntu1.1
 exim4-daemon-light              4.80-3ubuntu1.1

Ubuntu 12.04 LTS:
 exim4-daemon-custom             4.76-3ubuntu3.1
 exim4-daemon-heavy              4.76-3ubuntu3.1
 exim4-daemon-light              4.76-3ubuntu3.1

Ubuntu 11.10:
 exim4-daemon-custom             4.76-2ubuntu1.1
 exim4-daemon-heavy              4.76-2ubuntu1.1
 exim4-daemon-light              4.76-2ubuntu1.1

Ubuntu 11.04:
 exim4-daemon-custom             4.74-1ubuntu1.3
 exim4-daemon-heavy              4.74-1ubuntu1.3
 exim4-daemon-light              4.74-1ubuntu1.3

Ubuntu 10.04 LTS:
 exim4-daemon-custom             4.71-3ubuntu1.4
 exim4-daemon-heavy              4.71-3ubuntu1.4
 exim4-daemon-light              4.71-3ubuntu1.4

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

References:
 http://www.ubuntu.com/usn/usn-1618-1
 CVE-2012-5671

Package Information:
 https://launchpad.net/ubuntu/+source/exim4/4.80-3ubuntu1.1
 https://launchpad.net/ubuntu/+source/exim4/4.76-3ubuntu3.1
 https://launchpad.net/ubuntu/+source/exim4/4.76-2ubuntu1.1
 https://launchpad.net/ubuntu/+source/exim4/4.74-1ubuntu1.3
 https://launchpad.net/ubuntu/+source/exim4/4.71-3ubuntu1.4
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