lib/puppet/defaults.rb in Puppet 2.7.x before 2.7.18, and Puppet Enterprise before 2.5.2, uses 0644 permissions for last_run_report.yaml, which allows local users to obtain sensitive configuration information by leveraging access to the puppet master server to read this file.
https://bugzilla.redhat.com/show_bug.cgi?id=839135
http://www.ubuntu.com/usn/USN-1506-1
http://www.debian.org/security/2012/dsa-2511
http://secunia.com/advisories/50014
http://puppetlabs.com/security/cve/cve-2012-3866/
http://lists.opensuse.org/opensuse-updates/2012-07/msg00036.html