ActiveRecord in Ruby on Rails before 2.3.17, 3.1.x before 3.1.11, and 3.2.x before 3.2.12 allows remote attackers to bypass the attr_protected protection mechanism and modify protected model attributes via a crafted request.
https://groups.google.com/group/rubyonrails-security/msg/bb44b98a73ef1a06?dmode=source&output=gplain
http://www.securityfocus.com/bid/57896
http://www.openwall.com/lists/oss-security/2013/02/11/5
http://www.debian.org/security/2013/dsa-2620
http://weblog.rubyonrails.org/2013/2/11/SEC-ANN-Rails-3-2-12-3-1-11-and-2-3-17-have-been-released/
http://support.apple.com/kb/HT5784
http://secunia.com/advisories/52774
http://secunia.com/advisories/52112
http://rhn.redhat.com/errata/RHSA-2013-0686.html
http://lists.opensuse.org/opensuse-updates/2013-03/msg00048.html
http://lists.apple.com/archives/security-announce/2013/Jun/msg00000.html