Ubuntu Security Notice USN-1238-2
25th October, 2011
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.04
USN-1238-1 caused a regression on Ubuntu 11.04.
- puppet - Centralized configuration management
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.
The problem can be corrected by updating your system to the following package version:
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.