The Active Record component in Ruby on Rails 2.3.x, 3.0.x, 3.1.x, and 3.2.x does not ensure that the declared data type of a database column is used during comparisons of input values to stored values in that column, which makes it easier for remote attackers to conduct data-type injection attacks against Ruby on Rails applications via a crafted value, as demonstrated by unintended interaction between the "typed XML" feature and a MySQL database.

References

• https://nvd.nist.gov/vuln/detail/CVE-2013-3221
• https://gist.github.com/dakull/5442275
• https://groups.google.com/group/rubyonrails-security/msg/1f3bc0b88a60c1ce?dmode=source&output=gplain
• http://openwall.com/lists/oss-security/2013/02/06/7
• http://openwall.com/lists/oss-security/2013/04/24/7
• http://pl.reddit.com/r/netsec/comments/17yajp/mysql_madness_and_rails/
• http://www.phenoelit.org/blog/archives/2013/02/index.html