The festivaltts4r gem for Ruby allows remote attackers to execute arbitrary commands via shell metacharacters in a string to the (1) to_speech or (2) to_mp3 method in lib/festivaltts4r/festival4r.rb.Referenceshttp://www.openwall.com/lists/oss-security/2017/02/02/5http://www.openwall.com/lists/oss-security/2017/01/31/14https://github.com/spejman/festivaltts4r/issues/1
