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

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 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: https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2012-5671