The (1) template and (2) inline_template functions in the master server in Puppet before 2.6.18, 2.7.x before 2.7.21, and 3.1.x before 3.1.1, and Puppet Enterprise before 1.2.7 and 2.7.x before 2.7.2 allows remote authenticated users to execute arbitrary code via a crafted catalog request.
https://puppetlabs.com/security/cve/cve-2013-1640/
http://www.debian.org/security/2013/dsa-2643
http://ubuntu.com/usn/usn-1759-1
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