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Ubuntu Security Notice USN-1238-2

Ubuntu Security Notice USN-1238-2
Posted Oct 25, 2011
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1238-2 - USN-1238-1 fixed vulnerabilities in Puppet. The upstream patch introduced a regression in Ubuntu 11.04 when executing certain commands. This update fixes the problem. It was discovered that Puppet incorrectly handled the non-default "certdnsnames" option when generating certificates. If this setting was added to puppet.conf, the puppet master's DNS alt names were added to the X.509 Subject Alternative Name field of all certificates, not just the puppet master's certificate. An attacker that has an incorrect agent certificate in his possession can use it to impersonate the puppet master in a man-in-the-middle attack.

tags | advisory, vulnerability
systems | linux, ubuntu
advisories | CVE-2011-3872
MD5 | c68495a1f07f49f1ad6821bf20130d16

Ubuntu Security Notice USN-1238-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-1238-2
October 25, 2011

puppet regression
==========================================================================

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

- Ubuntu 11.04

Summary:

USN-1238-1 caused a regression on Ubuntu 11.04.

Software Description:
- puppet: Centralized configuration management

Details:

USN-1238-1 fixed vulnerabilities in Puppet. The upstream patch introduced a
regression in Ubuntu 11.04 when executing certain commands. This update
fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Puppet incorrectly handled the non-default
"certdnsnames" option when generating certificates. If this setting was
added to puppet.conf, the puppet master’s DNS alt names were added to the
X.509 Subject Alternative Name field of all certificates, not just the
puppet master’s certificate. An attacker that has an incorrect agent
certificate in his possession can use it to impersonate the puppet master
in a man-in-the-middle attack.

Update instructions:

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

Ubuntu 11.04:
puppet-common 2.6.4-2ubuntu2.6

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

References:
http://www.ubuntu.com/usn/usn-1238-2
http://www.ubuntu.com/usn/usn-1238-1
https://launchpad.net/bugs/881361

Package Information:
https://launchpad.net/ubuntu/+source/puppet/2.6.4-2ubuntu2.6


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