Ubuntu 11.10 USN-1238-1 Moderate: Puppet Master Impersonation Risk

ubuntu

October 24, 2011

The Puppet master server could be impersonated in certain configurations.

Summary

The Puppet master server could be impersonated in certain configurations.

Software Description:

- puppet: Centralized configuration management

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.

Topics Covered

security advisory moderate ubuntu man-in-the-middle configuration issue impersonation risk puppet

Update Instructions

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

Ubuntu 11.10:
  puppet-common                   2.7.1-1ubuntu3.2

Ubuntu 11.04:
  puppet-common                   2.6.4-2ubuntu2.5

Ubuntu 10.10:
  puppet-common                   2.6.1-0ubuntu2.4

Ubuntu 10.04 LTS:
  puppet-common                   0.25.4-2ubuntu6.5

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

If your puppet master's puppet.conf file has ever contained the
"certdnsnames" setting, you must reissue your site certificates, or apply
another mitigation technique. Please see the upstream advisory for more
information:

https://portal.perforce.com/s/cve-dashboard?CVE__c-filterId=00BPA0000009fOv2AI