Puppet 2.6.x before 2.6.18 and Puppet Enterprise 1.2.x before 1.2.7 allows remote authenticated users to execute arbitrary code on the puppet master, or an agent with puppet kick enabled, via a crafted request for a report.
https://puppetlabs.com/security/cve/cve-2013-2274/
http://www.securityfocus.com/bid/58447
http://www.debian.org/security/2013/dsa-2643
http://secunia.com/advisories/52596
http://rhn.redhat.com/errata/RHSA-2013-0710.html
http://lists.opensuse.org/opensuse-updates/2013-04/msg00056.html
http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00004.html