The open-uri-cached rubygem allows local users to execute arbitrary Ruby code by creating a directory under /tmp containing “openuri-” followed by a crafted UID, and putting Ruby code in said directory once a meta file is created.
www.benjaminfleischer.com/2013/03/20/yaml-and-security-in-ruby/
www.openwall.com/lists/oss-security/2015/05/06/2
www.securityfocus.com/bid/74469
github.com/tigris/open-uri-cached/blob/master/lib/open-uri/cached.rb#L115
github.com/tigris/open-uri-cached/blob/master/lib/open-uri/cached.rb#L25
github.com/tigris/open-uri-cached/blob/master/lib/open-uri/cached.rb#L39