The set_meta_data function in lib/cremefraiche.rb in the Creme Fraiche gem before 0.6.1 for Ruby allows remote attackers to execute arbitrary commands via shell metacharacters in the file name of an email attachment. NOTE: some of these details are obtained from third party information.
Improper Neutralization of Special Elements used in an OS Command The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command before it is sent to a downstream component.