lib/active_support/json/backends/yaml.rb in Ruby on Rails 2.3.x before 2.3.16 and 3.0.x before 3.0.20 does not properly convert JSON data to YAML data for processing by a YAML parser, which allows remote attackers to execute arbitrary code, conduct SQL injection attacks, or bypass authentication via crafted data that triggers unsafe decoding, a different vulnerability than CVE-2013-0156.
http://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html
http://lists.apple.com/archives/security-announce/2013/Mar/msg00002.html
http://rhn.redhat.com/errata/RHSA-2013-0201.html
http://rhn.redhat.com/errata/RHSA-2013-0202.html
http://rhn.redhat.com/errata/RHSA-2013-0203.html
https://groups.google.com/group/rubyonrails-security/msg/52179af76915e518?dmode=source&output=gplain
http://support.apple.com/kb/HT5784