USN-1130-1: Exim vulnerability

Releases

• Ubuntu 11.04
• Ubuntu 10.10
• Ubuntu 10.04

Packages

• exim4 - Exim mail transfer agent

Details

It was discovered that the Exim daemon did not correctly handle format
strings in DKIM headers. An unauthenticated remote attacker could send
specially crafted email to run arbitrary code as the Exim user. The
default compiler options for affected releases reduces the vulnerability
to a denial of service under most conditions.

Update instructions

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

Ubuntu 11.04

• exim4-daemon-heavy - 4.74-1ubuntu1.1
• exim4-daemon-custom - 4.74-1ubuntu1.1
• exim4-daemon-light - 4.74-1ubuntu1.1

Ubuntu 10.10

• exim4-daemon-heavy - 4.72-1ubuntu1.2
• exim4-daemon-custom - 4.72-1ubuntu1.2
• exim4-daemon-light - 4.72-1ubuntu1.2

Ubuntu 10.04

• exim4-daemon-heavy - 4.71-3ubuntu1.2
• exim4-daemon-custom - 4.71-3ubuntu1.2
• exim4-daemon-light - 4.71-3ubuntu1.2

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

References

• CVE-2011-1764