Cross-site request forgery (CSRF) vulnerability in the omniauth-oauth2 gem prior to 1.1.1 for Ruby allows remote attackers to hijack the authentication of users for requests that modify session state.
rubysec.github.io/advisories/CVE-2012-6134
seclists.org/oss-sec/2013/q1/304
github.com/intridea/omniauth-oauth2/pull/25
github.com/rubysec/ruby-advisory-db/blob/master/gems/omniauth-oauth2/CVE-2012-6134.yml
github.com/Shopify/omniauth-shopify-oauth2
github.com/Shopify/omniauth-shopify-oauth2/pull/1
nvd.nist.gov/vuln/detail/CVE-2012-6134
web.archive.org/web/20170312020947/https://gist.github.com/homakov/3673012