lib/puppet/ssl/certificate_authority.rb in Puppet before 2.6.17 and 2.7.x before 2.7.18, and Puppet Enterprise before 2.5.2, does not properly restrict the characters in the Common Name field of a Certificate Signing Request (CSR), which makes it easier for user-assisted remote attackers to trick administrators into signing a crafted agent certificate via ANSI control sequences.
https://bugzilla.redhat.com/show_bug.cgi?id=839158
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-2012-3867/
http://lists.opensuse.org/opensuse-updates/2012-07/msg00036.html
http://lists.opensuse.org/opensuse-security-announce/2012-08/msg00006.html