Ubuntu Security Notice 1130-1 - 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.
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Ubuntu Security Notice USN-1130-1
May 10, 2011
exim4 vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
Summary:
Exim could be made to run arbitrary code under some conditions.
Software Description:
- 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-custom 4.74-1ubuntu1.1
exim4-daemon-heavy 4.74-1ubuntu1.1
exim4-daemon-light 4.74-1ubuntu1.1
Ubuntu 10.10:
exim4-daemon-custom 4.72-1ubuntu1.2
exim4-daemon-heavy 4.72-1ubuntu1.2
exim4-daemon-light 4.72-1ubuntu1.2
Ubuntu 10.04 LTS:
exim4-daemon-custom 4.71-3ubuntu1.2
exim4-daemon-heavy 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
Package Information:
https://launchpad.net/ubuntu/+source/exim4/4.74-1ubuntu1.1
https://launchpad.net/ubuntu/+source/exim4/4.72-1ubuntu1.2
https://launchpad.net/ubuntu/+source/exim4/4.71-3ubuntu1.2