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, when listening for incoming connections is enabled and allowing access to the "run" REST endpoint is allowed, allows remote authenticated users to execute arbitrary code via a crafted HTTP request.
https://puppetlabs.com/security/cve/cve-2013-1653/
http://www.securityfocus.com/bid/58446
http://www.debian.org/security/2013/dsa-2643
http://ubuntu.com/usn/usn-1759-1
http://secunia.com/advisories/52596
http://lists.opensuse.org/opensuse-updates/2013-04/msg00056.html
http://lists.opensuse.org/opensuse-security-announce/2013-04/msg00004.html